Consolidated Income Statements (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
REVENUES	$ 119,359,000	$ 105,458,000	$ 237,472,000	$ 210,064,000
Cost of revenues	92,039,000	82,622,000	183,234,000	164,047,000
Gross profit	27,320,000	22,836,000	54,238,000	46,017,000
General and administrative expenses	12,224,000	11,981,000	25,066,000	24,155,000
Income before income tax provision	15,096,000	10,855,000	29,172,000	21,862,000
Income tax provision	6,421,000	4,225,000	11,888,000	8,636,000
NET INCOME	$ 8,675,000	$ 6,630,000	$ 17,284,000	$ 13,226,000
Net income per common and common equivalent share
Basic	$ 0.41	$ 0.29	$ 0.81	$ 0.59
Diluted	$ 0.41	$ 0.29	$ 0.80	$ 0.58
Weighted average common and common equivalent shares
Basic	21,138,000	22,540,000	21,267,000	22,584,000
Diluted	21,377,000	22,752,000	21,481,000	22,802,000