Deferred Tax Liability (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Contract and service revenues and costs	$ 69,597	$ 68,503
Expense reserves (bad debts, insurance, franchise tax and vacation)	14,770	14,612
Net operating loss carryforwards	3,543	3,682
Other, net	2,090	1,493
Total gross deferred tax assets	90,000	88,290
Valuation allowance	(608)	(650)
Net deferred tax assets	89,392	87,640
Accelerated tax depreciation	(40,857)	(32,331)
Accelerated tax amortization	(160,719)	(142,776)
Contract and service revenues and costs	(76,417)	(69,790)
Deferred Tax Liabilities, Gross	277,993	244,897
Total gross deferred liabilities	$ (188,601)	$ (157,257)