Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Net revenues
Net revenues	$ 57,864,000	$ 82,619,000	$ 104,512,000	$ 146,309,000
Cost of revenues
Cost of revenues	36,607,000	69,740,000	70,227,000	123,329,000
Gross profit	21,257,000	12,879,000	34,285,000	22,980,000
Selling, general and administrative expenses	1,601,000	3,297,000	5,044,000	6,325,000
Income from operations	19,656,000	9,582,000	29,241,000	16,655,000
Gains on the deconsolidation of variable interest entities	1,324,000		2,444,000
Other income (expense), net	410,000	(10,000)	566,000	(19,000)
Income from continuing operations before income taxes	21,390,000	9,572,000	32,251,000	16,636,000
Income tax expense	7,467,000	3,591,000	11,388,000	6,108,000
Income from continuing operations	13,923,000	5,981,000	20,863,000	10,528,000
Discontinued operations (Note 15)
Loss on discontinued operations before income taxes				(405,000)
Income tax benefit				120,000
Loss on discontinued operations				(285,000)
Net income	13,923,000	5,981,000	20,863,000	10,243,000
Income (loss) attributable to noncontrolling interests	1,300,000	(220,000)	1,830,000	(396,000)
Net income attributable to the stockholders of Argan	12,623,000	6,201,000	19,033,000	10,639,000
Continuing operations (Note 11)
Basic	$ 0.90	$ 0.45	$ 1.36	$ 0.80
Diluted	$ 0.89	$ 0.45	$ 1.35	$ 0.78
Discontinued operations
Basic				$ (0.02)
Diluted				$ (0.02)
Net income
Basic	$ 0.90	$ 0.45	$ 1.36	$ 0.78
Diluted	$ 0.89	$ 0.45	$ 1.35	$ 0.76
Weighted average number of shares outstanding:
Basic	13,997,000	13,697,000	13,986,000	13,680,000
Diluted	14,129,000	13,935,000	14,132,000	13,952,000
Power industry services
Net revenues
Net revenues	55,520,000	78,109,000	99,289,000	135,837,000
Cost of revenues
Cost of revenues	34,804,000	66,182,000	66,050,000	115,166,000
Telecommunications infrastructure services
Net revenues
Net revenues	2,344,000	4,510,000	5,223,000	10,472,000
Cost of revenues
Cost of revenues	$ 1,803,000	$ 3,558,000	$ 4,177,000	$ 8,163,000