CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS
REVENUES	$ 232,945	$ 175,444	$ 723,237	$ 468,287
Cost of revenues	195,227	138,866	594,016	359,395
GROSS PROFIT	37,718	36,578	129,221	108,892
Selling, general and administrative expenses	10,119	9,848	30,408	24,429
Impairment loss (Note 7)				1,979
INCOME FROM OPERATIONS	27,599	26,730	98,813	82,484
Other income, net	1,692	690	4,221	1,283
INCOME BEFORE INCOME TAXES	29,291	27,420	103,034	83,767
Income tax expense	12,062	8,194	37,738	27,122
NET INCOME	17,229	19,226	65,296	56,645
Net income attributable to non-controlling interests		1,153	303	6,668
NET INCOME ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.	17,229	18,073	64,993	49,977
Foreign currency translation adjustments, net of tax	(139)	(326)	754	(192)
COMPREHENSIVE INCOME ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.	$ 17,090	$ 17,747	$ 65,747	$ 49,785
EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.
Basic (in dollars per share)	$ 1.11	$ 1.19	$ 4.19	$ 3.34
Diluted (in dollars per share)	$ 1.09	$ 1.16	$ 4.11	$ 3.23
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING
Basic (in shares)	15,545	15,137	15,509	14,974
Diluted (in shares)	15,793	15,601	15,796	15,490
CASH DIVIDENDS PER SHARE (Note 11)	$ 1.00	$ 1.00	$ 1.00	$ 1.00