CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS
REVENUES	$ 141,366	$ 230,489
Cost of revenues	125,914	190,393
GROSS PROFIT	15,452	40,096
Selling, general and administrative expenses	9,637	9,489
INCOME FROM OPERATIONS	5,815	30,607
Other income, net	764	1,218
INCOME BEFORE INCOME TAXES	6,579	31,825
Income tax expense	1,737	11,076
NET INCOME	4,842	20,749
Net income attributable to non-controlling interests	5	124
NET INCOME ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.	4,837	20,625
Foreign currency translation adjustments	(579)	104
COMPREHENSIVE INCOME ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.	$ 4,258	$ 20,729
EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.
Basic (in Dollars per share)	$ 0.31	$ 1.33
Diluted (in Dollars per share)	$ 0.31	$ 1.31
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING
Basic (in shares)	15,568	15,467
Diluted (in shares)	15,656	15,771
CASH DIVIDENDS PER SHARE (Note 11)	$ 0.25