Consolidated Income Statements - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
REVENUES	$ 124,460,000	$ 123,714,000	$ 251,399,000	$ 248,078,000
Cost of revenues	97,776,000	98,247,000	198,532,000	194,911,000
Gross profit	26,684,000	25,467,000	52,867,000	53,167,000
General and administrative expenses	13,209,000	12,749,000	28,171,000	26,954,000
Income before income tax provision	13,475,000	12,718,000	24,696,000	26,213,000
Income tax provision	5,208,000	4,835,000	9,529,000	10,031,000
NET INCOME	$ 8,267,000	$ 7,883,000	$ 15,167,000	$ 16,182,000
Net income per common and common equivalent share
Basic	$ 0.42	$ 0.38	$ 0.76	$ 0.78
Diluted	$ 0.41	$ 0.37	$ 0.75	$ 0.77
Weighted average common and common equivalent shares
Basic	19,902,000	20,819,000	20,026,000	20,877,000
Diluted	20,063,000	21,050,000	20,199,000	21,130,000