Federal and State Income Taxes - Components of Deferred Income Tax (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Income Tax Contingency [Line Items]
Deferred income tax assets	$ 26,239	$ 18,924
Deferred Tax Assets, Gross [Abstract]
Allowance for doubtful accounts	3,169	3,295
Vacation pay accrual	4,827	4,228
Bonus accrual	4,141	5,661
Contract loss reserves	2,189	1,832
Other accruals	4,855	3,468
Total deferred income tax assets	29,915	23,709
Unearned revenue	(893)	(1,333)
Other long-term liabilities	(38)	(70)
Loss carryforwards	917	925
Legal reserve	834	1,414
Revenue recognition on long-term contracts	(670)	(488)
Stock-based compensation expense	2,553	2,886
Depreciation	(2,075)	(1,421)
Deferred Tax Liabilities, Net	0	(1,473)
Goodwill and intangible asset amortization	6,430	0
Total deferred income tax liabilities	(3,676)	(4,785)
Net deferred income tax assets	26,239	$ 18,924
Accounting Standards Update 2015-17
Income Tax Contingency [Line Items]
Deferred income tax assets	18,924
Accounting Standards Update 2015-17 | Adjustment
Income Tax Contingency [Line Items]
Deferred income tax assets	$ 16,057