Consolidated Statements of Operations (USD $)	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Net revenues
Net revenues	$ 141,850,000	$ 182,592,000
Cost of revenues
Cost of revenues	118,748,000	153,469,000
Gross profit	23,102,000	29,123,000
Selling, general and administrative expenses	11,186,000	12,129,000
Income from operations	11,916,000	16,994,000
Other income, net	48,000	50,000
Income from continuing operations before income taxes	11,964,000	17,044,000
Income tax expense	4,556,000	7,037,000
Income from continuing operations	7,408,000	10,007,000
Discontinued operations
Income (loss) on discontinued operations (including gain on disposal of $1,312,000 for the year ended January 31, 2012, see Note 5)	282,000	(3,557,000)
Income tax benefit	1,280,000	1,324,000
Income (loss) on discontinued operations	1,562,000	(2,233,000)
Net income	8,970,000	7,774,000
Less - Loss attributable to noncontrolling interest (variable interest entities)	302,000
Net income attributable to Argan, Inc. stockholders	9,272,000	7,774,000
Continuing Operations
Basic	$ 0.57	$ 0.74
Diluted	$ 0.56	$ 0.73
Discontinued Operations
Basic	$ 0.11	$ (0.16)
Diluted	$ 0.11	$ (0.16)
Net Income
Basic	$ 0.68	$ 0.57
Diluted	$ 0.67	$ 0.57
Weighted average number of shares outstanding:
Basic	13,612,000	13,593,000
Diluted	13,792,000	13,709,000
Cash dividend per common share	$ 0.50
Power industry services
Net revenues
Net revenues	132,519,000	174,938,000
Cost of revenues
Cost of revenues	111,193,000	146,976,000
Telecommunications infrastructure services
Net revenues
Net revenues	9,331,000	7,654,000
Cost of revenues
Cost of revenues	$ 7,555,000	$ 6,493,000