Income Taxes Income Taxes (Tables)

12 Months Ended

Jun. 30, 2016

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The provision for income taxes from continuing operations consists of the following:

	Year Ended June 30,
	2016		2015		2014
Current:
Federal	$	66,574	$	70,555	$	77,937
State	7,571		5,221		10,166
Deferred:
Federal	34,355		28,018		10,636
State	3,169		1,425		2,116
	$	111,669	$	105,219	$	100,855

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The tax effects of temporary differences related to deferred taxes shown on the balance sheets were:

	June 30,
	2016			2015
Deferred tax assets:
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
Deferred tax liabilities:
Accelerated tax depreciation	(40,857		)	(32,331		)
Accelerated tax amortization	(160,719		)	(142,776		)
Contract and service revenues and costs	(76,417		)	(69,790		)
Total gross deferred liabilities	(277,993		)	(244,897		)
Net deferred tax liability	$	(188,601	)	$	(157,257	)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The following analysis reconciles the statutory federal income tax rate to the effective income tax rates reflected above:

	Year Ended June 30,
	2016		2015		2014
Computed "expected" tax expense	35.0	%	35.0	%	35.0	%
Increase (reduction) in taxes resulting from:
State income taxes, net of federal income tax benefits	1.9	%	1.4	%	2.8	%
Research and development credit	(2.5	)%	(1.5	)%	(0.8	)%
Domestic production activities deduction	(1.9	)%	(2.0	)%	(2.2	)%
Tax over book basis in subsidiary stock	(1.7	)%	—	%	—	%
Other (net)	0.2	%	0.4	%	0.3	%
	31.0	%	33.3	%	35.1	%

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

A reconciliation of the unrecognized tax benefits for the years ended June 30, 2016 and 2015 follows:

	Unrecognized Tax Benefits
Balance at July 1, 2014	$	7,834
Additions for current year tax positions	1,351
Reductions for current year tax positions	(56		)
Additions for prior year tax positions	483
Reductions for prior year tax positions	(998		)
Reductions related to expirations of statute of limitations	(1,510		)
Balance at June 30, 2015	7,104
Additions for current year tax positions	1,581
Reductions for current year tax positions	(56		)
Additions for prior year tax positions	507
Reductions for prior year tax positions	(38		)
Reductions related to expirations of statute of limitations	(1,677		)
Balance at June 30, 2016	$	7,421