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SUBSEQUENT EVENTS (Details) - USD ($) |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 04, 2015 | Nov. 30, 2015 | Oct. 31, 2015 | Oct. 31, 2014
Roberts Company And Atlantic Projects Company Limited Member |  |  |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |
Pro forma revenues |  |  | $ 452,474,000 | $ 379,869,000
Pro forma net income |  |  | 31,763,000 | 34,456,000
Pro forma net income attributable to the stockholders of Argan, Inc. |  |  | $ 20,336,000 | $ 25,323,000
Earnings Per Share, Pro Forma [Abstract] |  |  |  |
Basic (in dollars per share) |  |  | $ 1.38 | $ 1.75
Diluted (in dollars per share) |  |  | $ 1.35 | $ 1.72
Subsequent Event [Member] | Variable Interest Entity [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Proceeds from sale of business |  | $ 2,555,000 |  |
Percentage of development success fee received |  | 60.00% |  |
Percentage of development success fee paid to Moxie Freedom's equipment supplier |  | 40.00% |  |
Subsequent Event [Member] | The Roberts Company Member |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Cash paid at closing | $ 500,000 |  |  |
Potential additional cash payments for achievement of performance conditions | 500,000 |  |  |
Cash payments to retire outstanding debt and certain leases | $ 16,000,000 |  |  |
Subsequent Event [Member] | The Roberts Company Member | TRC Acquisition LLC Member |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Ownership interest (as a percent) | 100.00% |  |  |

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