Statement of Financial Position [Abstract] Statement [Table] Class of Stock [Axis] Statement [Line Items] Class of Stock [Domain] Assets [Abstract] Assets Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Cash and cash equivalents at beginning of the period Cash and cash equivalents at end of the period Due from Affiliate, Current Due from affiliates Other Receivables Other receivables Restricted Cash and Cash Equivalents, Current Restricted cash Assets, Current, Total Total current assets Property, Plant and Equipment, Gross, Total Property, plant, and equipment, at cost Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less accumulated depreciation Property, Plant and Equipment, Net, Total Net property, plant, and equipment Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total Investment in National Beef Packing Company, LLC Restricted Cash and Cash Equivalents, Noncurrent Restricted cash Other Assets, Noncurrent Other assets Assets, Total Total assets Liabilities [Abstract] Liabilities and Capital Shares and Equities Accounts Payable, Trade, Current Accounts payable - trade Due to Affiliate, Current Due to affiliates Employee-related Liabilities, Current Accrued compensation and benefits Other Accrued Liabilities, Current Other accrued expenses and liabilities Patronage Notice Payable In Cash Patronage notices payable in cash Total of patronage notice payable in cash. Distributions Payable Distributions Payable Total amount of distributions payable. Liabilities, Current, Total Total current liabilities Liabilities, Noncurrent [Abstract] Long-term liabilities: Employee Related Liabilities Non current Accrued compensation and benefits Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the noncurrent portion of the liabilities due after one year (or the normal operating cycle, if longer). Liabilities, Total Total liabilities Stockholders Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Capital shares and equities: Members Capital Members' capital, 735,385 Class A units and 755,385 Class B units authorized, issued and outstanding Balance at December 29, 2012 Balance at September 28, 2013 Liabilities And Capital Shares And Equities Total liabilities and capital shares and equities Total of all Liabilities and Capital Shares and Equities items, including the portion of equity attributable to noncontrolling interests. Limited Liability Company Capital Account Units Authorized Members capital, units authorized The number of limited liability company units authorized to be issued. Limited Liability Company Capital Account Units Issued Members capital, units issued The number of limited liability company units issued. Limited Liability Company Capital Account Units Outstanding Members capital, units outstanding The number of limited liability company units outstanding. Class Units [Member] Class A units Class B Units [Member] Class B Units Income Statement [Abstract] Revenue, Net, Total Net sales Costs and Expenses [Abstract] Costs and expenses: Cost of Goods Sold, Total Cost of sales Selling, General and Administrative Expense, Total Selling, general, and administrative expenses Depreciation, Depletion and Amortization, Total Depreciation and amortization Costs and Expenses, Total Total costs and expenses Total costs and expenses Operating Income (Loss), Total Operating loss Operating income Nonoperating Income (Expense) [Abstract] Other income (expense): Investment Income, Interest Interest income Interest Expense, Total Interest expense Equity Interest In Net Income Of Subsidiary Equity interest in net income of National Beef Packing Company, LLC Equity in earnings of National Beef Packing Company, LLC This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Other Nonoperating Income (Expense), Total Other, net Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest, Total Income before taxes Allocation of net income for the thirty-nine week period ended September 28, 2013 Income before taxes Income Tax Expense (Benefit) Income tax expense Income tax expense Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Net income Net income Net income Earnings Per Limited Liability Company Unit [Abstract] Basic Per unit amount NetIncome Loss Per Outstanding Limited Liability Company Class Unit Basic Class A units (in dollars per unit) Class A (in dollars per unit) Net income (loss) allocated to each outstanding limited liability company Class A unit. Net Income Loss Per Outstanding Limited Liability Company Class B Unit Basic Class B units (in dollars per unit) Class B (in dollars per unit) Net income (loss) allocated to each outstanding limited liability company Class B unit. Net Income Loss Per Outstanding Limited Liability Company Unit Diluted [Abstract] Diluted Per unit amount Net Income Loss Per Outstanding Limited Liability Company Class Unit Diluted Class A units (in dollars per unit) Class A units (in dollars per unit) Net income or loss allocated to each limited liability company unit outstanding during the reporting period and Class A unit that would have been outstanding assuming the issuance of limited liability company units for all dilutive potential units outstanding during the reporting period. Net Income Loss Per Outstanding Limited Liability Company Class B Unit Diluted Class B units (in dollars per unit) Class B units (in dollars per unit) Net income or loss allocated to each limited liability company unit outstanding during the reporting period and Class B unit that would have been outstanding assuming the issuance of limited liability company units for all dilutive potential units outstanding during the reporting period. Weighted Average Number Of Units Outstanding Basic [Abstract] Basic Weighted average outstanding units (denominator) Weighted Average Limited Liability Company Class Units Outstanding Basic Class A units (in units) Weighted average outstanding Class A units The average number of limited liability company Class A units issued and outstanding that are used in calculating basic earnings per unit. Weighted Average Limited Liability Company Class B Units Outstanding Basic Class B units (in units) Class B units (in units) Weighted average outstanding Class B units The average number of limited liability company Class B units issued and outstanding that are used in calculating basic earnings per unit. Weighted Average Number Of Units Outstanding Diluted [Abstract] Diluted Weighted Average Limited Liability Company Class Units Outstanding Diluted Class A units (in units) Units (denominator) The average number of limited liability Class A company units issued and outstanding that are used in calculating diluted earnings per unit. Weighted Average Limited Liability Company Class B Units Outstanding Diluted Class B units (in units) Units (denominator) The average number of limited liability Class B company units issued and outstanding that are used in calculating diluted earnings per unit. Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net (loss) income to net cash provided by operating activities: Distribution From Member Or Limited Partner Cash Distribution Distribution from National Beef Packing Company, LLC The amount of cash distributions received from a common shareholder or unit-holder by a LLC or LP. Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities: Increase (Decrease) in Due from Affiliates, Current Due from affiliates Increase (Decrease) in Other Receivables Other receivables Increase (Decrease) in Prepaid Expense and Other Assets, Total Other assets Increase (Decrease) in Accounts Payable, Total Accounts payable Increase (Decrease) in Due to Affiliates, Current Due to affiliates Increase (Decrease) in Employee Related Liabilities, Total Accrued compensation and benefits Increase (Decrease) in Other Accrued Liabilities Other accrued expenses and liabilities Net Cash Provided by (Used in) Operating Activities, Continuing Operations, Total Net cash (used in) provided by operating activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Cash flows from investing activities: Payments to Acquire Additional Interest in Subsidiaries Additional minority interest acquired in National Beef Packing Company, LLC Payments to Acquire Property, Plant, and Equipment, Total Capital expenditures, including interest capitalized Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Cash flows from financing activities: Payment Of Patronage Notices Payments of patronage notices The cash outflow for patronage notices. Change In Overdraft Balances Change in overdraft balances This is the net cash inflow or outflow associated with checks that have been issued, but have not yet cleared. Prior Year Excess Distribution Prior year excess distribution The cash inflow from prior year excess distribution. Divident Distribution Member distributions The cash outflow from members distribution. Net Cash Provided by (Used in) Financing Activities, Continuing Operations, Total Net cash provided by (used in) financing activities Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations Effect of exchange rate changes on cash Cash and Cash Equivalents, Period Increase (Decrease), Total Net decrease in cash Interim Financial Statements [Abstract] Subsidiary, Sale of Stock [Axis] Name Of Acquiree Name of acquiree Represents name of acquiree. Name Of Acquirer Name of acquirer Represents name of acquirer. Membership Interest Ownership Percentage Acquired Ownership in NBP sold to Leucadia National Corporation The percentage of ownership interests sold to another party. Sale of Stock, Percentage of Ownership after Transaction Remaining membership interests in National Beef Packing Company, LLC (NBP) Legal Entity [Axis] Entity [Domain] Parent Company [Member] USPB Controlling And Noncontrolling Interest [Line Items] Controlling And Noncontrolling Interest [Line Items] Sale of Stock, Name of Transaction [Domain] Purchase Agreement [Member] Membership Interest Purchase Agreement Members Capital [Abstract] Increase (Decrease) in Stockholders Equity [Roll Forward] Members Capital [Roll Forward] Earnings Per Unit [Abstract] Net Income (Loss) Attributable to Parent [Abstract] Income attributable to USPB available to unitholders (numerator) Net Income Attributable To Parent Available To Basic Class Class A The portion of profit or loss for the period, net of income taxes, which is attributable to the parent available to Class A. Net Income Attributable To Parent Available To Class B Class B The portion of profit or loss for the period, net of income taxes, which is attributable to the parent available to Class B. Income Loss From Operations Attributable To Parents [Abstract] Income attributable to USPB available to unitholders (numerator) Net Income Attributable To Parent Available To Class Diluted Class A The portion of profit or loss for the period, net of income taxes, which is attributable to the parent available to Class A diluted unitholders. Net Income Attributable To Parent Available To Class B Diluted Class B The portion of profit or loss for the period, net of income taxes, which is attributable to the parent available to Class B diluted unitholders. Effect Of Dilutive Securities Class Unit Options Effect of dilutive securities - Class A unit options Effect of dilutive securities -Class A unit options. Effect Of Dilutive Securities Class B Unit Options Effect of dilutive securities - Class B unit options Effect of dilutive securities -Class B unit options. Percentage Of Income Allocated To Unit Holders Percentage of Income allocated to Class A unit holders This represents the percentage of income allocated to limited liability Class A unit holders. Percentage Of Income Allocated To Class B Unit Holders Percentage of Income allocated to Class B unit holders This represents the percentage of income allocated to limited liability Class B unit holders. Description Of Condition For Maximum Units Authorized To Issue And Conversion Of Rights To Units Description of condition for maximum units authorized to issue and conversion of rights to units Represents the description of condition for maximum units authorized to issue and conversion of rights to units. Number Of Shares Ceo Can Purchase Number of shares CEO may purchase on termination or eighteen months after termination to Class A unitholders Number of units that CEO can purchase, upon mutual agreement of the board of the company and the CEO. Number Of Shares Converted Into Unit Appreciation Rights Number of shares converted into unit appreciation rights to Class A unitholders Number of shares that converted into Unit Appreciation Rights. Maximum Number Of Shares Purchase Or Converted Into Contractual Rights Maximum number of shares purchase or converted into contractual rights to Class A unitholders Maximum number of shares purchase or converted into contractual rights. Per Unit Price To Purchase Or Convert Contractual Rights Into Class Units Per unit price to purchase or convert contractual rights to Class A unitholders (in dollars per unit) This represents the purchase price of unit or conversion price per unit of appreciation rights. Investments in and Advances to Affiliates, Schedule of Investments [Abstract] Schedule of Investments [Line Items] National Beef Packing Company Llc [Member] National Beef Packing Company, LLC Net Income Loss Attributable To Noncontrolling Interest One Less: net income attributable to Kansas City Steak Company, LLC The portion of net Income or Loss attributable to the noncontrolling interest in subsidiary. Net Income Loss Attributable To Noncontrolling Interest Two Net income attributable to NBP The portion of net Income or Loss attributable to the noncontrolling interest in subsidiary. Net Income (Loss) Attributable to Parent, Total NBP's net income attributable to USPB Restricted Cash [Abstract] Escrow Deposit Amount of proceeds deposited in escrow account related to transaction with Leucadia Percentage Of Escrow Funds For Indemnification Claims For First Year Percentage of escrow funds for indemnification claims for first year Represents the percentage of escrow funds for indemnification claims for first year. Proceeds From Escrow Deposits Proceeds from escrow deposits Represents the amount received from escrow deposit funds during the period. Percentage Of Escrow Funds For Indemnification Claims For Second Year Percentage of escrow funds for indemnification claims for second year Represents the percentage of escrow funds for indemnification claims for second year. Restricted Cash and Cash Equivalent Item, Description Description of restricted cash Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Accounting [Text Block] Interim Financial Statements Earnings Per Share [Text Block] Income (Loss) Attributable to USPB Per Unit Investments in and Advances to Affiliates, Schedule of Investments [Text Block] Investment in National Beef Packing Company, LLC Restricted Cash [Text Block] Restricted Cash The entire disclosure for restricted cash. Reconciliation Of Members Capital [Table Text Block] Schedule Of Reconciliation Of Members Capital The entire tabular disclosure for beginning balance of members capital changes during the year and ending balance. Schedule Of Income Per Unit Calculation [Table Text Block] Schedule of Income (Loss) Per Unit Calculation Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends, if any. Schedule Of Investment Under Equity Method Accounting [Table Text Block] Schedule of summary of the results of operations for NBP Statement of operations for the company in which the filer has an investment that is carried under the equity method of accounting. Net Cash Provided by (Used in) Investing Activities, Continuing Operations, Total Net cash used in investing activities Document And Entity Information [Abstract] Document Information [Table] Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Document Type Amendment Flag Document Period End Date Document Fiscal Period Focus Members Capital [Text Block] Members’ Capital The entire disclosure for Members’ capital. Document Information [Line Items] Common Class A [Member] Common Class B [Member] Document Fiscal Year Focus