CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
CONSOLIDATED STATEMENTS OF EARNINGS
REVENUES	$ 238,997	$ 482,153	$ 892,815
Cost of revenues	245,817	399,715	743,490
GROSS (LOSS) PROFIT	(6,820)	82,438	149,325
Selling, general and administrative expenses	44,125	40,710	41,764
Impairment loss	4,895	1,491	584
(LOSS) INCOME FROM OPERATIONS	(55,840)	40,237	106,977
Other income, net	8,075	6,981	5,648
(LOSS) INCOME BEFORE INCOME TAXES	(47,765)	47,218	112,625
Income tax benefit (expense)	7,053	4,651	(40,279)
NET (LOSS) INCOME	(40,712)	51,869	72,346
Net income (loss) attributable to non-controlling interests	1,977	(167)	335
NET (LOSS) INCOME ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.	(42,689)	52,036	72,011
Foreign currency translation adjustments	(770)	(1,768)	2,184
COMPREHENSIVE (LOSS) INCOME ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.	$ (43,459)	$ 50,268	$ 74,195
(LOSS) INCOME PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.
Basic (in Dollars per share)	$ (2.73)	$ 3.34	$ 4.64
Diluted (in Dollars per share)	$ (2.73)	$ 3.32	$ 4.56
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING
Basic (in shares)	15,621	15,569	15,522
Diluted (in shares)	15,621	15,693	15,780
CASH DIVIDENDS PER SHARE (Note 15)	$ 1.00	$ 1.00	$ 1.00