Prepaid expenses and other Total current assets Current assets TOTAL ASSETS Total assets Assets (in Dollars) Accrued expenses and other current liabilities 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 Gross Profit Income before income taxes Net income Net income Income from continuing operations Net income attributable to REX common shareholders Balance (in Shares) Balance (in Shares) Equity Components [Axis] CASH, CASH EQUIVALENTS AND RESTRICTED CASH-Beginning of year CASH, CASH EQUIVALENTS AND RESTRICTED CASH-End of year Total cash, cash equivalents and restricted cash Total Inventory Total property and equipment Total Property and equipment - net Revision of Prior Period [Axis] Segments [Axis] Investment, Name [Axis] Total liabilities Liabilities (in Dollars) Net income Fair Value Hierarchy and NAV [Axis] Total Other assets Total Total lease expense Total Operating Leases, Future Minimum Payments Due Operating lease liabilities Operating Lease, Liability Statistical Measurement [Axis] Derivative Instrument [Axis] Non-Vested Shares, Beginning of Period Non-Vested Shares, End of Period Weighted Average Grant Date Fair Value, Beginning of Period Weighted Average Grant Date Fair Value, End of Period Weighted Average Vesting Term, Beginning of Period Weighted Average Vesting Term, End of Period Total Total Total Unrecognized tax benefits, beginning of year Unrecognized tax benefits, end of year Unrecognized tax benefits, end of year Measurement Input Type [Axis] CURRENT ASSETS: Cash and cash equivalents Short-term investments Short-Term Investments Accounts receivable Refundable income taxes Refundable income taxes Operating lease right-of-use assets Equity method investments Carrying amount Equity Method Investments LIABILITIES AND EQUITY CURRENT LIABILITIES: Accounts payable – trade (includes $1.4 million and $5.8 million with related parties at January 31, 2025 and 2024, respectively) Accounts payable - trade, related parties (in Dollars) Current operating lease liabilities LONG-TERM LIABILITIES: Deferred taxes Long-term operating 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; 29,853 shares issued Common stock, shares authorized Authorized shares Common stock, shares issued Issued shares Common stock, par value (in Dollars per share) Paid in capital Retained earnings Treasury stock, shares Noncontrolling interests Net sales and revenue Sales of products, continuing operations: Net Sales and Revenue Cost of sales (includes $99.2 million, $117.0 million and $135.4 million with related parties for the years ended January 31, 2025, 2024 and 2023, 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) Weighted average shares outstanding – diluted (in Shares) Weighted average shares - diluted Diluted net income per share attributable to REX common shareholders (in Dollars per share) Net (loss) income Treasury stock acquired Treasury stock acquired (in Shares) Issuance of equity awards, stock based compensation expense Issuance of equity awards, stock based compensation expense (in Shares) Capital contributions Proceeds from Contributions from Affiliates CASH FLOWS FROM OPERATING ACTIVITIES: Adjustments to reconcile net income to net cash provided by operating activities: Depreciation Amortization of operating lease right-of-use assets Stock-based compensation expense Share-Based Payment Arrangement, Expense Dividends received from equity method investments Proceeds from Equity Method Investment, Distribution Interest income from investments Deferred income tax Changes in assets and liabilities: Accounts payable – trade Long-term taxes payable Accrued expenses and other liabilities Net cash provided by operating activities CASH FLOWS FROM INVESTING ACTIVITIES: Maturities of short-term investments Proceeds from sale of real estate and property and equipment Net cash (used in) provided by investing activities CASH FLOWS FROM FINANCING ACTIVITIES: Capital contributions from minority investor Payments to noncontrolling interests holders Net cash used in financing activities NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH Non-cash financing activities-Stock awards issued Non-cash financing activities-Stock awards accrued Non-cash financing activities-Stock repurchases accrued Non-cash investing activities-Accrued capital expenditures Non-cash investing activities-Capital additions transferred from prepaid expenses Right-of-use assets acquired and liabilities incurred upon lease execution Reconciliation of total cash, cash equivalents and restricted cash: Restricted cash Treasury stock, 12,659 and 12,350 shares, respectively Selling, general and administrative expenses Selling, general and administrative Provision for income taxes Benefit for income taxes Provision for income taxes Net income attributable to noncontrolling interests Noncontrolling interests distribution and other Loss (gain) 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 Auditor Firm [Member] Common Stock [Member] Treasury Stock, Common [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Noncontrolling Interest [Member] Significant Accounting Policies [Text Block] Schedule of Inventory, Current [Table Text Block] Ethanol and other finished goods Work in process Grain and other raw materials Property, Plant and Equipment [Table Text Block] Land and improvements Buildings and improvements Machinery, equipment and fixtures Construction in progress Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] Revenue from Contract with Customer [Text Block] Schedule of Disaggregated Revenue by Product [Table Text Block] Sales of products: Investment [Text Block] Equity Method Investments [Table Text Block] Ownership percentage Condensed Balance Sheet [Table Text Block] Non current assets Members’ capital Noncontrolling interests Total members’ equity Schedule of Financial Information for Equity Method Investments [Table Text Block] Fair Value Disclosures [Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Forward purchase contracts asset Commodity futures Total assets Forward purchase contracts liability Other Assets Disclosure [Text Block] Schedule of Other Assets [Table Text Block] Deferred taxes Prepaid utility equipment deposit Other Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Other Current Liabilities [Table Text Block] Accrued payroll and related items Accrued utility charges Accrued transportation related items Forward purchase contracts Accrued income taxes Other