Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Net revenues
Net revenues	$ 46,648,000	$ 63,690,000
Cost of revenues
Cost of revenues	33,620,000	53,589,000
Gross profit	13,028,000	10,101,000
Selling, general and administrative expenses	3,443,000	3,028,000
Income from operations	9,585,000	7,073,000
Gain on deconsolidation of variable interest entity	1,120,000
Other income (expense), net	155,000	(9,000)
Income from continuing operations before income taxes	10,860,000	7,064,000
Income tax expense	3,920,000	2,517,000
Income from continuing operations	6,940,000	4,547,000
Discontinued operations (Note 15)
Loss on discontinued operations before income tax benefit		(405,000)
Income tax benefit		120,000
Loss on discontinued operations		(285,000)
Net income	6,940,000	4,262,000
Income (loss) attributable to noncontrolling interest	530,000	(176,000)
Net income attributable to the stockholders of Argan, Inc.	6,410,000	4,438,000
Continuing operations (Note 11)
Basic	$ 0.46	$ 0.35
Diluted	$ 0.45	$ 0.34
Discontinued operations
Basic		$ (0.02)
Diluted		$ (0.02)
Net income
Basic	$ 0.46	$ 0.32
Diluted	$ 0.45	$ 0.32
Weighted average number of shares outstanding:
Basic	13,974,000	13,663,000
Diluted	14,127,000	13,950,000
Telecommunications infrastructure services
Net revenues
Net revenues	2,879,000	5,962,000
Cost of revenues
Cost of revenues	2,374,000	4,605,000
Power industry services
Net revenues
Net revenues	43,769,000	57,728,000
Cost of revenues
Cost of revenues	$ 31,246,000	$ 48,984,000