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 Income before income taxes Net income from continuing operations Net income from continuing operations Income from continuing operations Net income attributable to REX common shareholders (continuing operations) Net income attributable to REX common shareholders (continuing operations) 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 - net Segments [Axis] Total liabilities Liabilities (in Dollars) Legal Entity [Axis] Net income Net income attributable to REX common shareholders Investment, Name [Axis] Fair Value Hierarchy and NAV [Axis] Total Other assets Total Total lease expense Total Operating Leases, Future Minimum Payments Due Operating lease liabilities 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 (in Dollars) Weighted Average Grant Date Fair Value, End of Period (in Dollars) 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 Document Type Document Annual Report Current Fiscal Year End Date Document Period End Date Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company ICFR Auditor Attestation Flag Entity Shell Company Entity Public Float Entity Common Stock, Shares Outstanding Documents Incorporated by Reference [Text Block] Auditor Firm ID Auditor Name Auditor Location Amendment Flag Document Fiscal Period Focus Document Fiscal Year Focus Document Transition Report Entity Central Index Key CURRENT ASSETS: Cash and cash equivalents Short-term investments Short-Term Investments Restricted cash Accounts receivable 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 $1.5 million and $0.5 million with related parties at January 31, 2023 and 2022, respectively) Accounts payable - trade, related parties (in Dollars) Accounts Payable, Related Parties, Current Current operating lease liabilities LONG-TERM LIABILITIES: Deferred taxes Long-term operating lease liabilities Other long-term liabilities COMMITMENTS AND CONTINGENCIES (Notes 11 and 13) EQUITY: REX shareholders’ equity: Common stock, 45,000 shares authorized, 29,853 shares issued at par Common stock, shares authorized Authorized shares Common stock, shares issued Issued shares Paid in capital Retained earnings Treasury stock, shares Noncontrolling interests Net sales and revenue Sales of products, continuing operations: Cost of sales (includes $135.4 million, $90.2 million and $54.8 million with related parties for the years ended January 31, 2023, 2022 and 2021, respectively) 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 Net income from discontinued operations, net of tax (includes expense of $0.3 million and $(0.2) million with related parties for the years ended January 31, 2022 and 2021, respectively. Net income from discontinued operations, net of tax Net income from discontinued operations, net of tax Net income from discontinued operations, net of tax, related parties Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party Net income attributable to REX common shareholders (discontinued operations) Net income attributable to REX common shareholders (discontinued operations) Net income attributable to REX common shareholders Weighted average shares outstanding – basic and diluted Basic and diluted net income per share from continuing operations attributable to REX common shareholders Basic and diluted net income per share from discontinued operations attributable to REX common shareholders Basic and diluted net income per share attributable to REX common shareholders Net (loss) income Net income including noncontrolling interests Capital contributions Proceeds from Contributions from Affiliates 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) 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 Accrued expenses and other liabilities Net cash provided by operating activities from continuing operations Net cash used in operating activities from discontinued operations Net cash provided by operating activities CASH FLOWS FROM INVESTING ACTIVITIES: Sales 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: Payments to noncontrolling interests holders Net cash used in financing activities from continuing operations Net cash provided by financing activities from discontinued operations Net cash used in financing activities NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH Continued from the previous page Non cash financing activities-Stock awards issued Non cash financing activities-Stock awards accrued Non cash investing activities-Accrued capital expenditures Right-of-use assets acquired and liabilities incurred upon lease execution