Total current assets Current assets TOTAL ASSETS Related Party Transaction [Axis] Total current liabilities Current liabilities Total long-term liabilities Long-term liabilities Total REX shareholders’ equity Total equity Balance Balance TOTAL LIABILITIES AND EQUITY Gross profit Gross profit Income before income taxes Income before taxes Net income Net income Total consolidated net income Net income attributable to REX common shareholders Balance (in Shares) Balance (in Shares) Equity Components [Axis] Net cash provided by operating activities Net cash (used in) provided by investing activities Net cash used in financing activities NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS CASH AND CASH EQUIVALENTS-Beginning of year CASH AND CASH EQUIVALENTS-End of year SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract] Total Inventory Total property and equipment Total property and equipment, net Property and equipment - net NET SALES AND REVENUE [Abstract] Product and Service [Axis] INVESTMENT [Abstract] Investment, Name [Axis] Asset Class [Axis] Total liabilities Total members’ equity Equity Method Investment, Nonconsolidated Investee [Axis] FAIR VALUE [Abstract] Financial Instrument [Axis] Fair Value Hierarchy and NAV [Axis] Measurement Frequency [Axis] OTHER ASSETS [Abstract] Total Other assets ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES [Abstract] Total Accrued expenses and other current liabilities LEASES [Abstract] Total lease expense Total Lessee, Operating Lease, Liability, to be Paid Total Finance lease liability to be paid COMMON STOCK [Abstract] DERIVATIVE FINANCIAL INSTRUMENTS [Abstract] Derivative Instrument [Axis] EMPLOYEE BENEFITS [Abstract] Beginning balance, Non-vested shares (in Shares) Ending balance, Non-vested shares (in Shares) Number of shares unvested (in Shares) Beginning balance, Weighted average grant date fair value Ending balance, Weighted average grant date fair value Beginning balance, Weighted average vesting term Ending balance, Weighted average vesting term Weighted average shares – diluted Weighted average shares outstanding – diluted (in Shares) INCOME TAXES [Abstract] Total Total Benefit (provision) for income taxes Benefit (provision) for income taxes Provision for income taxes Total Total Net deferred tax liability Total Income Tax Jurisdiction [Axis] Total Schedule Of Unrecognized Tax Benefits Roll Forward [Abstract] Unrecognized tax benefits, beginning of year Unrecognized tax benefits, end of year Unrecognized tax benefits, end of year Measurement Input Type [Axis] CONTINGENCIES [Abstract] RELATED PARTIES [Abstract] SEGMENT REPORTING [Abstract] Segments [Axis] Schedule II - VALUATION AND QUALIFYING ACCOUNTS [Abstract] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] Balance beginning of year Balance end of year CURRENT ASSETS: Cash and cash equivalents Short-term investments Accounts receivable Accounts receivables Refundable income taxes Refundable income taxes Prepaid expenses and other Operating lease right-of-use assets Finance lease right-of-use assets Equity method investments Carrying amount Equity method investments, carrying value CURRENT LIABILITIES: Accounts payable – trade (includes $1.2 million and $1.4 million with related parties at January 31, 2026 and 2025, respectively) Accounts payable - trade, related parties Current operating lease liabilities Current finance lease liabilities LONG-TERM LIABILITIES: Deferred taxes Long-term operating lease liabilities Long-term finance lease liabilities Long-term taxes payable Other long-term liabilities COMMITMENTS AND CONTINGENCIES (Notes 11 and 13) EQUITY: REX shareholders’ equity: Common stock, at $0.01 par value; 45,000 shares authorized; 32,938 and 34,389 shares issued at January 31, 2026 and 2025, respectively Common stock, par value (in Dollars per share) Common stock, authorized (in Shares) Authorized shares (in Shares) Common stock, issued (in Shares) Issued shares (in Shares) Paid in capital Retained earnings Noncontrolling interests Net sales and revenue Revenue by Product Cost of sales (includes $86.4 million, $99.2 million and $117.0 million with related parties for the years ended January 31, 2026, 2025 and 2024, respectively) Cost of sales Cost of sales, related parties Equity in income of unconsolidated affiliates Income from equity method investments Income (loss) from equity method investments Interest and other income, net Weighted average shares outstanding – basic (in Shares) Weighted average shares – basic Basic net income per share attributable to REX common shareholders (in Dollars per share) Diluted net income per share attributable to REX common shareholders (in Dollars per share) Net income Capital contributions Issuance of equity awards and stock-based compensation expense Issuance of equity awards and stock-based compensation expense (in Shares) CASH FLOWS FROM OPERATING ACTIVITIES: Adjustments to reconcile net income to net cash provided by operating activities: Depreciation Noncash operating lease expense Amortization of finance lease right-of-use assets Stock-based compensation expense Dividends received from equity method investments Interest income from investments Deferred income tax Changes in assets and liabilities: Accounts payable – trade Long-term taxes payable Accrued expenses and other liabilities CASH FLOWS FROM INVESTING ACTIVITIES: Maturities of short-term investments Proceeds from disposal of real estate and property and equipment CASH FLOWS FROM FINANCING ACTIVITIES: Capital contributions from minority investor Paid to landowners Non-cash investing activities-Accrued capital expenditures Non-cash investing activities-Capital additions transferred from prepaid expenses Non-cash financing activities-Stock awards issued Non-cash financing activities-Stock awards accrued Non-cash financing activities-Stock repurchases accrued Operating right-of-use assets acquired and liabilities incurred upon lease commencement Finance right-of-use assets acquired and liabilities incurred upon lease commencement Selling, general and administrative expenses Net income attributable to noncontrolling interests Noncontrolling interests distribution and other Stock repurchases Stock repurchases (in Shares) Correction to equity awards and stock-based compensation expense Correction to equity awards and stock-based compensation expense (in Shares) Loss on disposal of real estate and property and equipment Accounts receivable Inventory Prepaid expenses and other assets Income taxes refundable Capital expenditures Purchases of short-term investments Deposits Treasury stock acquired Payments to noncontrolling interests holders Principal paid on finance lease liabilities Related Party [Member] Common Stock [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Noncontrolling Interest [Member] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Schedule of Inventory Ethanol and other finished goods Work in process Grain and other raw materials Schedule of Property and Equipment Land and improvements Buildings and improvements Machinery, equipment and fixtures Construction in progress NET SALES AND REVENUE Schedule of Disaggregated Revenue by Product INVESTMENTS Schedule of Equity Method Investments Ownership percentage Summarized Financial Information for Equity Method Investee Non current assets