Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Income Statement [Abstract]
Revenues	$ 892,574	$ 739,046	$ 627,052
Cost of revenues	797,872	659,428	552,138
Gross profit	94,702	79,618	74,914
Selling, general and administrative expenses	57,988	47,983	44,014
Operating income	36,714	31,635	30,900
Other income (expense):
Interest expense	(800)	(814)	(795)
Interest income	32	26	71
Other	(30)	(357)	440
Income before income tax expense	35,916	30,490	30,616
Provision for federal, state and foreign income taxes	11,908	13,302	11,634
Net income	$ 24,008	$ 17,188	$ 18,982
Basic earnings per common share	$ 0.92	$ 0.66	$ 0.72
Diluted earnings per common share	$ 0.91	$ 0.65	$ 0.71
Weighted average common shares outstanding:
Basic	25,962	25,921	26,406
Diluted	26,358	26,298	26,686