Consolidated Income Statements (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
REVENUES	$ 123,714,000	$ 119,359,000	$ 248,078,000	$ 237,472,000
Cost of revenues	98,247,000	92,039,000	194,911,000	183,234,000
Gross profit	25,467,000	27,320,000	53,167,000	54,238,000
General and administrative expenses	12,749,000	12,224,000	26,954,000	25,066,000
Income before income tax provision	12,718,000	15,096,000	26,213,000	29,172,000
Income tax provision	4,835,000	6,421,000	10,031,000	11,888,000
NET INCOME	$ 7,883,000	$ 8,675,000	$ 16,182,000	$ 17,284,000
Net income per common and common equivalent share
Basic	$ 0.38	$ 0.41	$ 0.78	$ 0.81
Diluted	$ 0.37	$ 0.41	$ 0.77	$ 0.80
Weighted average common and common equivalent shares
Basic	20,819,000	21,138,000	20,877,000	21,267,000
Diluted	21,050,000	21,377,000	21,130,000	21,481,000