EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
EARNINGS PER SHARE
Net income attributable to the stockholders of Argan, Inc.	$ 85,459	$ 32,358	$ 33,098
Weighted average shares outstanding - basic	13,448	13,365	14,083
Effect of stock awards	458	183	93
Weighted average shares outstanding - diluted	13,906	13,548	14,176
Basic (in dollars per share)	$ 6.35	$ 2.42	$ 2.35
Diluted (in dollars per share)	$ 6.15	$ 2.39	$ 2.33
Anti-dilutive securities not included	105	685	979