Class of Stock [Axis] Class A Units [Member] Class B Units [Member] Equity Components [Axis] Members' Capital Legal Entity [Axis] National Beef Packing Company, LLC [Member] Property, Plant and Equipment, Type [Axis] Machinery and Equipment [Member] Furniture and Fixtures [Member] Trailers and Automotive Equipment [Member] Lender Name [Axis] CoBank [Member] Credit Facility [Axis] Revolving Credit Facility [Member] Plan Name [Axis] Management Phantom Unit Plan [Member] Award Type [Axis] Class A Phantom Units [Member] Class B Phantom Units [Member] Concentration Risk Benchmark [Axis] Cattle requirements [Member] Certain Members of Management [Member] Subsequent Event Type [Axis] Subsequent Event [Member] Statement [Table] Statement [Line Items] Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity a Well-known Seasoned Issuer Entity a Voluntary Filer Entity's Reporting Status Current Entity Filer Category Entity Common Stock, Shares Outstanding Document Fiscal Period Focus Document Fiscal Year Focus Entity Public Float Entity Emerging Growth Entity Small Business Entity Shell Company Statement of Financial Position [Abstract] Assets Current assets: Cash and cash equivalents Due from affiliates Other current assets Total current assets Property, plant, and equipment, at cost Less accumulated depreciation Net property, plant, and equipment Investment in National Beef Packing Company, LLC Other assets Total assets Liabilities and Capital Shares and Equities Current liabilities: Accounts payable - trade Due to affiliates Accrued compensation and benefits Other accrued expenses and liabilities Distributions payable Total current liabilities Long-term liabilities: Other liabilities Total long-term liabilities Total liabilities Commitments and contingencies Capital shares and equities: Members' capital, 735,385 Class A units and 755,385 Class B units authorized, issued and outstanding Total capital shares and equities Total liabilities and capital shares and equities Members' capital, units authorized Members' capital, units issued Members' capital, units outstanding Net sales Costs and expenses: Cost of sales Selling, general, and administrative expenses Depreciation and amortization Total costs and expenses Operating loss Other income (expense): Interest income Interest expense Equity in net income of National Beef Packing Company, LLC Other, net Total other income Net income Income per unit: Basic and diluted Outstanding weighted-average Class A and Class B units: Basic and diluted Beginning Balance Net income for the year Member distribution Ending Balance Statement of Cash Flows [Abstract] Cash flows from operating activities: Net income Adjustments to reconcile net income to net cash provided by operating activities: Equity in net income of National Beef Packing Company, LLC Distributions from National Beef Packing Company, LLC Changes in assets and liabilities: Due from affiliates Other assets Accounts payable Due to affiliates Accrued compensation and benefits Other accrued expenses and liabilities Net cash provided by operating activities Cash flows from investing activities: Capital expenditures, including interest capitalized Distributions from National Beef Packing Company, LLC Net cash provided by investing activities Cash flows from financing activities: Partnership distributions and redemptions Net cash used in financing activities Net (decrease) increase in cash Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Supplemental cash disclosures: Cash paid during the period for interest Supplemental noncash disclosures of financing activities: Distributions payable Accounting Policies [Abstract] Description of Business Basis of Presentation and Accounting Policies Debt Disclosure [Abstract] Long-Term Debt and Loan Agreements Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Employee Options and Benefit Plans Other Income and Expenses [Abstract] Other Income Income Tax Disclosure [Abstract] Income Taxes Related Party Transactions [Abstract] Related Party Transactions Commitments and Contingencies Disclosure [Abstract] Legal Proceedings Quarterly Financial Information Disclosure [Abstract] Quarterly Results (Unaudited) Subsequent Events [Abstract] Subsequent Events Basis of Presentation Fiscal Year Use of Estimates Cash and Cash Equivalents Investment in National Beef Packing Company, LLC Property, Plant and Equipment New Accounting Standard Distributions Payable Income Taxes Selling, General and Administrative Noncompetition Payments Business Segments Earnings Per Unit Schedule of Property Plant And Equipment Estimated Useful Life Schedule of cost and accumulated depreciation for property, plant, and equipment Schedule of Income Per Unit Calculation Schedule of selected quarterly financial data for fiscal years Equity method percentage owned Property and equipment useful lives Property, plant and equipment, gross Accumulated depreciation Property, plant and equipment, net Basic and diluted earnings per unit: Income attributable to USPB available to unitholders (numerator) Weighted average outstanding units (denominator) Per unit amount Payments for noncompetition agreement Accrued Noncompetition Payments Credit line maximum borrowing capacity Credit line, remaining borrowing capacity Credit line expiration date Rent expense Share-based compensation expense Phantom units outstanding 401K plan expenses Other non-operating income Income tax expense Concentration percentage Accounts receivable from unitholders Accounts payables to unitholders Net Sales Operating Loss Net Income (Loss) Basic and Diluted Earnings Per Unit Proportionate share price of purchase price of Iowa Premium Class A Units [Member] Class B Units [Member] Distributions from equity method investments classified as operating activities Distributions payable Document and entity information [Abstract] 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). 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. National Beef Packing Company, LLC [Member] Post employment payments provided for in former CEO';s employment agreements [Policy Text Block] Tabular disclosure of useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. Distributions payable [Policy Text Block] Proportionate share of purchase price of Iowa Premium Partnership distributions and redemptions Assets, Current Assets [Default Label] Liabilities, Current Liabilities, Noncurrent Liabilities Members' Equity Liabilities and Equity Costs and Expenses Interest Expense Other Operating Income (Expense), Net Partners' Capital Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid Increase (Decrease) in Due from Affiliates, Current Increase (Decrease) in Prepaid Expense and Other Assets Increase (Decrease) in Due to Affiliates, Current Increase (Decrease) in Employee Related Liabilities Increase (Decrease) in Other Accrued Liabilities Net Cash Provided by (Used in) Operating Activities Payments to Acquire Property, Plant, and Equipment Proceeds from Equity Method Investment, Distribution, Return of Capital Net Cash Provided by (Used in) Investing Activities PartnershipDistributionsAndRedemptions Net Cash Provided by (Used in) Financing Activities Cash and Cash Equivalents, Period Increase (Decrease) DistributionsPayableCashFlow Equity and Cost Method Investments, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Income Tax Expense (Benefit)