00100 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS
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00200 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS
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00300 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
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40701 - Disclosure - PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details)
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41202 - Disclosure - INCOME TAXES - Reconciliation of Expected Income Tax Expense to Actual Income Tax Expense (Details)
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41401 - Disclosure - EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. (Details)
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00090 - Document - Document and Entity Information
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00205 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)
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10101 - Disclosure - DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION
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10201 - Disclosure - RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS
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10301 - Disclosure - SPECIAL PURPOSE ENTITIES
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10501 - Disclosure - CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS
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10601 - Disclosure - ACCOUNTS RECEIVABLE
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10701 - Disclosure - PURCHASED INTANGIBLE ASSETS
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10801 - Disclosure - FINANCING ARRANGEMENTS
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10901 - Disclosure - LEGAL MATTERS
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11001 - Disclosure - STOCK-BASED COMPENSATION
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11101 - Disclosure - CASH DIVIDENDS
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11201 - Disclosure - INCOME TAXES
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11301 - Disclosure - CUSTOMER CONCENTRATIONS
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11401 - Disclosure - EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.
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11501 - Disclosure - SEGMENT REPORTING
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20102 - Disclosure - DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Policies)
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30403 - Disclosure - REVENUE RECOGNITION (Tables)
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30703 - Disclosure - PURCHASED INTANGIBLE ASSETS (Tables)
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31003 - Disclosure - STOCK-BASED COMPENSATION (Tables)
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31203 - Disclosure - INCOME TAXES (Tables)
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31403 - Disclosure - EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. (Tables)
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31503 - Disclosure - SEGMENT REPORTING (Tables)
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40101 - Disclosure - DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Details)
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40301 - Disclosure - SPECIAL PURPOSE ENTITIES (Details)
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40401 - Disclosure - REVENUE RECOGNITION - Impact of the Adoption of the New Accounting Standard (Details)
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40402 - Disclosure - REVENUE RECOGNITION - Update to Significant Accounting Policies (Details)
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40404 - Disclosure - REVENUE RECOGNITION - Disaggregation of Revenues (Details)
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40501 - Disclosure - CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS (Details)
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40801 - Disclosure - FINANCING ARRANGEMENTS (Details)
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40901 - Disclosure - LEGAL MATTERS (Details)
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41001 - Disclosure - STOCK-BASED COMPENSATION - Additional Information (Details)
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41002 - Disclosure - STOCK-BASED COMPENSATION - Summary of Activity under Company's Stock Option Plans (Details)
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41003 - Disclosure - STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details)
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41004 - Disclosure - STOCK-BASED COMPENSATION - Summary of Assumptions Used to Estimate Fair Value of Stock Options Granted (Details)
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41101 - Disclosure - CASH DIVIDENDS (Details)
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41201 - Disclosure - INCOME TAXES - Tax Reform Act (Details)
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41301 - Disclosure - CUSTOMER CONCENTRATIONS (Details)
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41402 - Disclosure - EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. - Antidilutive Shares (Details)
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41501 - Disclosure - SEGMENT REPORTING (Details)
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10401 - Disclosure - REVENUE RECOGNITION
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40403 - Disclosure - REVENUE RECOGNITION - Remaining Unsatisfied Performance Obligations (Details)
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