Federal and State Income Taxes - Components of Deferred Income Tax (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014
Deferred Tax Assets, Gross [Abstract]
Deferred income tax assets	$ 16,057	$ 12,293
Revenue recognition on long-term contracts	(68,579)	(70,398)
Deferred Tax Assets and Liabilities, Current
Deferred Tax Assets, Gross [Abstract]
Allowance for doubtful accounts	3,295	3,343
Vacation pay accrual	4,228	3,611
Bonus accrual	5,661	3,872
Contract loss reserves	1,832	993
Other accruals	2,374	2,498
Total deferred income tax assets	17,390	14,317
Unearned revenue	(1,333)	(1,987)
Other long-term liabilities	0	(37)
Total deferred income tax liabilities	(1,333)	(2,024)
Deferred income tax assets	16,057	12,293
Deferred Tax Assets and Liabilities, Noncurrent
Deferred Tax Assets, Gross [Abstract]
Other long-term liabilities	(70)	(155)
Loss carryforwards	925	1,081
Legal reserve	1,414	567
Stock-based compensation expense	2,886	3,619
Other long-term assets	1,094	993
Total long-term deferred income tax assets	6,319	6,260
Depreciation	(1,421)	(1,496)
Goodwill and intangible asset amortization	(1,473)	(129)
Revenue recognition on long-term contracts	(488)	(213)
Net long-term deferred income tax liabilities	(3,452)	(1,993)
Net long-term deferred income tax assets	2,867	4,267
Net deferred income tax assets	$ 18,924	$ 16,560