CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
CONSOLIDATED STATEMENTS OF EARNINGS
REVENUES	$ 392,206	$ 238,997	$ 482,153
Cost of revenues	330,139	245,817	399,715
GROSS PROFIT (LOSS) (Note 4)	62,067	(6,820)	82,438
Selling, general and administrative expenses	39,041	44,125	40,710
Impairment losses	0	4,895	1,491
INCOME (LOSS) FROM OPERATIONS	23,026	(55,840)	40,237
Other income, net	1,859	8,075	6,981
INCOME (LOSS) BEFORE INCOME TAXES	24,885	(47,765)	47,218
Income tax (expense) benefits (Note 13)	(1,074)	7,053	4,651
NET INCOME (LOSS)	23,811	(40,712)	51,869
Net (loss) income attributable to non-controlling interests	(40)	1,977	(167)
NET INCOME (LOSS) ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.	23,851	(42,689)	52,036
Foreign currency translation adjustments	35	(770)	(1,768)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.	$ 23,886	$ (43,459)	$ 50,268
NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.
Basic	$ 1.52	$ (2.73)	$ 3.34
Diluted	$ 1.51	$ (2.73)	$ 3.32
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING
Basic	15,668	15,621	15,569
Diluted	15,825	15,621	15,693
CASH DIVIDENDS PER SHARE	$ 3.00	$ 1.00	$ 1.00