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QUARTERLY FINANCIAL INFORMATION (unaudited) - Schedule of Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
QUARTERLY FINANCIAL INFORMATION (unaudited)                      
Revenues $ 169,578 $ 232,945 $ 259,803 $ 230,489 $ 206,760 $ 175,444 $ 162,495 $ 130,348 $ 892,815 $ 675,047 $ 413,275
Gross profit 20,104 37,718 51,407 40,096 37,819 36,578 44,012 28,302 149,325 146,711 99,465
Income from operations 8,163 27,599 40,608 30,607 29,770 26,730 34,499 21,255 106,977 112,254 74,405
Net income 7,050 17,229 27,318 20,749 20,781 19,226 23,299 14,120 72,346 77,426 50,204
Net income attributable to the stockholders of Argan, Inc. $ 7,018 $ 17,229 $ 27,139 $ 20,625 $ 20,351 $ 18,073 $ 19,674 $ 12,230 $ 72,011 $ 70,328 $ 36,345
Earnings per share                      
Basic (in Dollars per share) $ 0.45 $ 1.11 $ 1.75 $ 1.33 $ 1.33 $ 1.19 $ 1.32 $ 0.82 $ 4.64 $ 4.67 $ 2.46
Diluted (in Dollars per share) $ 0.45 $ 1.09 $ 1.72 $ 1.31 $ 1.29 $ 1.16 $ 1.29 $ 0.81 $ 4.56 $ 4.50 $ 2.42