Consolidated Balance Sheets [Abstract] Total current assets Total assets Related Party Transaction [Axis] Total current liabilities Total long-term liabilities Total REX shareholders’ equity Total equity Balance Balance Total liabilities and equity Consolidated Statements of Operations [Abstract] Gross profit Gross profit Income before income taxes Income before income taxes Income before taxes Net income Net income Net income attributable to REX common shareholders Net income attributable to REX common shareholders Consolidated Statements of Equity [Abstract] Balance (in Shares) Balance (in Shares) Equity Components [Axis] Net cash used in operating activities Net cash (used in) provided by investing activities Net cash used in financing activities Net decrease in cash and cash equivalents Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Consolidated Financial Statements [Abstract] Accounting Policies [Abstract] Revision of Prior Period [Axis] Total Inventory Net Sales and Revenue [Abstract] Product and Service [Axis] Leases [Abstract] Total lease expense Total Operating lease cost Total Finance lease liability to be paid (in Dollars) Fair Value [Abstract] Financial Instrument [Axis] Fair Value Hierarchy and NAV [Axis] Measurement Frequency [Axis] Property and Equipment [Abstract] Total property and equipment Total Other Assets [Abstract] Total Other assets Accrued Expenses and Other Current Liabilities [Abstract] Total Accrued expenses and other current liabilities Derivative Financial Instruments [Abstract] Derivative Instrument [Axis] Investments [Abstract] Investment, Name [Axis] Legal Entity [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 Income Taxes [Abstract] Unrecognized tax benefits, beginning of period Unrecognized tax benefits, end of period Unrecognized tax benefits, end of period Unrecognized tax benefits Measurement Input Type [Axis] Commitments and Contingencies [Abstract] Related-Party Transactions [Abstract] Segment Reporting [Abstract] Segments [Axis] Document Type Document Quarterly Report Document Period End Date Document Fiscal Year Focus Document Transition Report 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 Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Central Index Key Amendment Flag Document Fiscal Period Focus Current Fiscal Year End Date Assets Current assets: Cash and cash equivalents Short-term investments Accounts receivable Accounts receivables Refundable income taxes Refundable income taxes Prepaid expenses and other Property and equipment, net Operating lease right-of-use assets Finance lease right-of-use assets Equity method investment Carrying Amount Liabilities and equity Current liabilities: Accounts payable – trade (includes $1,486 and $1,195 with related parties at April 30, 2026 and January 31, 2026, 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 Other long-term liabilities Equity: REX shareholders’ equity: Common stock Paid in capital Retained earnings Noncontrolling interests Net sales and revenue Revenue by product Production tax credit income Cost of sales (includes $18,840 and $24,849 with related parties for the three months ended April 30, 2026 and 2025, respectively.) Cost of sales Cost of sales, related parties Equity in income of unconsolidated affiliates Income from equity method investments Interest and other income, net Weighted average shares outstanding – basic (in Shares) Weighted average shares outstanding – diluted (in Shares) 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) 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 used in operating activities: Depreciation Noncash operating lease expense Amortization of finance lease right-of-use assets Stock-based compensation expense Deferred income taxes 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 Deposits Cash flows from financing activities: Non-cash investing activities – Accrued capital expenditures Non-cash investing activities – Capital additions transferred from prepaid expenses Non-cash financing activities – Stock awards accrued Non-cash financing activities – Stock repurchases accrued Non-cash financing activities – Excise tax on 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 Provision for income taxes Benefit (provision) for income taxes Provision for income taxes Provision for income taxes Net income attributable to noncontrolling interests Net income attributable to noncontrolling interests Stock repurchases Stock repurchases (in Shares) Noncontrolling interests distribution and other Interest income from investments Loss on disposal of property and equipment – net Accounts receivable Inventory Prepaid expenses and other Refundable income taxes Capital expenditures Purchases of short-term investments Treasury stock acquired Payments to noncontrolling interests holders Principal paid on finance lease liabilities Related Party [Member] Common Stock [Member] Paid-in Capital [Member] Retained Earnings [Member] Noncontrolling Interest [Member] Consolidated Financial Statements Accounting Policies Summary of Reclassifications Net income Total consolidated net income Schedule of Inventory Ethanol and other finished goods Work in process