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Quarterly Financial Information (Unaudited) - Schedule of Quarterly Financial Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
Condensed Financial Information Of Parent Company Only Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 59,491,000 | $ 63,452,000 | $ 57,864,000 | $ 46,648,000 | $ 57,840,000 | $ 74,486,000 | $ 82,619,000 | $ 63,690,000 | $ 227,455,000 | $ 278,635,000 | $ 141,850,000
Gross profit | 20,687,000 | 23,876,000 | 21,257,000 | 13,028,000 | 14,019,000 | 13,136,000 | 12,879,000 | 10,101,000 | 78,848,000 | 50,135,000 | 23,102,000
Income from continuing operations | 10,032,000 | 12,449,000 | 13,923,000 | 6,940,000 | 5,861,000 | 5,713,000 | 5,981,000 | 4,547,000 | 43,344,000 | 22,102,000 | 7,408,000
Net income | 10,032,000 | 12,449,000 | 13,923,000 | 6,940,000 | 5,861,000 | 5,713,000 | 5,981,000 | 4,262,000 | 43,344,000 | 21,817,000 | 8,970,000
Net income attributable to the stockholders of Argan, Inc. | $ 9,164,000 | $ 11,928,000 | $ 12,623,000 | $ 6,410,000 | $ 6,561,000 | $ 6,065,000 | $ 6,201,000 | $ 4,438,000 | $ 40,125,000 | $ 23,265,000 | $ 9,272,000
Earnings per share |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.64 | $ 0.85 | $ 0.90 | $ 0.46 | $ 0.47 | $ 0.44 | $ 0.45 | $ 0.32 | $ 2.85 | $ 1.69 | $ 0.68
Diluted | $ 0.63 | $ 0.83 | $ 0.89 | $ 0.45 | $ 0.46 | $ 0.43 | $ 0.45 | $ 0.32 | $ 2.78 | $ 1.65 | $ 0.67

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