CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
REVENUES
Revenues	$ 130,348	$ 85,488
COST OF REVENUES
Cost of revenues	102,046	64,321
GROSS PROFIT	28,302	21,167
Selling, general and administrative expenses	7,047	5,540
INCOME FROM OPERATIONS	21,255	15,627
Other income, net	37	85
INCOME BEFORE INCOME TAXES	21,292	15,712
Income tax expense	7,172	4,861
NET INCOME	14,120	10,851
Net income attributable to noncontrolling interests (Note 3)	1,890	3,348
NET INCOME ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.	12,230	7,503
OTHER COMPREHENSIVE INCOME, NET OF TAX
Foreign currency translation adjustments, net of income tax	645
COMPREHENSIVE INCOME ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.	$ 12,875	$ 7,503
EARNINGS PER SHARE ATTRIBUTABLE TO THE STOCKHOLDERS OF ARGAN, INC.
Basic (in Dollars per share)	$ 0.82	$ 0.51
Diluted (in Dollars per share)	$ 0.81	$ 0.50
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING
Basic (in shares)	14,842	14,637
Diluted (in shares)	15,055	14,864
Power Industry Services
REVENUES
Revenues	$ 108,099	$ 82,884
COST OF REVENUES
Cost of revenues	83,698	62,379
GROSS PROFIT	24,401	20,505
Selling, general and administrative expenses	3,234	3,583
INCOME FROM OPERATIONS	21,167	16,922
Other income, net	14	79
INCOME BEFORE INCOME TAXES	21,181	17,001
Industrial Fabrication And Field Services
REVENUES
Revenues	20,410
COST OF REVENUES
Cost of revenues	16,988
GROSS PROFIT	3,422
Selling, general and administrative expenses	1,633
INCOME FROM OPERATIONS	1,789
INCOME BEFORE INCOME TAXES	1,789
Telecommunications Infrastructure Services
REVENUES
Revenues	1,839	2,604
COST OF REVENUES
Cost of revenues	1,360	1,942
GROSS PROFIT	479	662
Selling, general and administrative expenses	327	304
INCOME FROM OPERATIONS	152	358
INCOME BEFORE INCOME TAXES	$ 152	$ 358