Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Net revenues
Net revenues	$ 63,690,000	$ 15,993,000
Cost of revenues
Cost of revenues	53,589,000	12,095,000
Gross profit	10,101,000	3,898,000
Selling, general and administrative expenses	3,028,000	2,759,000
Income from operations	7,073,000	1,139,000
Other (expense) income, net	(9,000)	22,000
Income from continuing operations before income taxes	7,064,000	1,161,000
Income tax expense	2,517,000	416,000
Income from continuing operations	4,547,000	745,000
Discontinued operations
Loss on discontinued operations (including gain on disposal of $152,000 in 2011)	(405,000)	(65,000)
Income tax benefit (expense)	120,000	(74,000)
Loss on discontinued operations	(285,000)	(139,000)
Net income	4,262,000	606,000
Less - Loss attributable to noncontrolling interest	176,000
Net income attributable to the stockholders of Argan, Inc.	4,438,000	606,000
Continuing operations (Note 12)
Basic	$ 0.35	$ 0.05
Diluted	$ 0.34	$ 0.05
Discontinued operations
Basic	$ (0.02)	$ (0.01)
Diluted	$ (0.02)	$ (0.01)
Net income
Basic	$ 0.32	$ 0.04
Diluted	$ 0.32	$ 0.04
Weighted average number of shares outstanding:
Basic	13,663,000	13,601,000
Diluted	13,950,000	13,679,000
Telecommunications Infrastructure Services
Net revenues
Net revenues	5,962,000	1,974,000
Cost of revenues
Cost of revenues	4,605,000	1,614,000
Power Industry Services
Net revenues
Net revenues	57,728,000	14,019,000
Cost of revenues
Cost of revenues	$ 48,984,000	$ 10,481,000