CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS
REVENUES	$ 63,059	$ 136,670	$ 112,603	$ 278,036
Cost of revenues	60,094	105,962	130,664	231,876
GROSS PROFIT (LOSS) (Note 2)	2,965	30,708	(18,061)	46,160
Selling, general and administrative expenses	10,038	10,378	19,626	20,015
Impairment loss (Note 5)			2,072
(LOSS) INCOME FROM OPERATIONS	(7,073)	20,330	(39,759)	26,145
Other income, net	1,642	2,928	3,894	3,692
(LOSS) INCOME BEFORE INCOME TAXES	(5,431)	23,258	(35,865)	29,837
Income tax benefit (expense)	6,411	(6,314)	6,932	(8,051)
NET INCOME (LOSS)	980	16,944	(28,933)	21,786
Net loss attributable to non-controlling interests	(174)	(28)	(287)	(23)
NET INCOME (LOSS) ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.	1,154	16,972	(28,646)	21,809
Foreign currency translation adjustments	(6)	(693)	(1,060)	(1,272)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.	$ 1,148	$ 16,279	$ (29,706)	$ 20,537
EARNINGS (LOSS) PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC. (Note 12)
Basic (in Dollars per share)	$ 0.07	$ 1.09	$ (1.84)	$ 1.40
Diluted (in Dollars per share)	$ 0.07	$ 1.08	$ (1.84)	$ 1.39
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING
Basic (in shares)	15,633	15,568	15,608	15,568
Diluted (in shares)	15,757	15,673	15,608	15,673
CASH DIVIDENDS PER SHARE (Note 10)	$ 0.25	$ 0.25	$ 0.50	$ 0.50