Income Taxes Income Taxes (Tables)

12 Months Ended

Jun. 30, 2015

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,
	2015		2014		2013
Current:
Federal	$	70,555	$	77,937	$	54,574
State	5,221		10,166		4,540
Deferred:
Federal	28,018		10,636		14,689
State	1,425		2,116		3,647
	$	105,219	$	100,855	$	77,450

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,
	2015			2014
Deferred tax assets:
Contract and service revenues and costs	$	68,503		$	71,383
Expense reserves (bad debts, insurance, franchise tax and vacation)	14,612			14,776
Net operating loss carryforwards	3,682			4,218
Other, net	1,493			1,148
	88,290			91,525
Deferred tax liabilities:
Accelerated tax depreciation	(32,331		)	(29,247		)
Accelerated tax amortization	(142,776		)	(125,054		)
Contract and service revenues and costs	(69,790		)	(64,338		)
	(244,897		)	(218,639		)
Net deferred tax liability before valuation allowance	(156,607		)	(127,114		)
Valuation allowance	(650		)	(700		)
Net deferred tax liability	$	(157,257	)	$	(127,814	)

The deferred taxes are classified on the balance sheets as follows:

	2015			2014
Deferred income taxes (current)	$	(7,034	)	$	(30,094	)
Deferred income taxes (long-term)	(150,223		)	(97,720		)
	$	(157,257	)	$	(127,814	)

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,
	2015		2014		2013
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	1.4	%	2.8	%	2.2	%
Research and development credit	(1.5	)%	(0.8	)%	(3.5	)%
Domestic production activities deduction	(2.0	)%	(2.2	)%	(2.3	)%
Other (net)	0.4	%	0.3	%	0.2	%
	33.3	%	35.1	%	31.6	%

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, 2015 and 2014 follows:

	Unrecognized Tax Benefits
Balance at July 1, 2013	$	4,890
Additions for current year tax positions	1,380
Reductions for current year tax positions	—
Additions for prior year tax positions	1,662
Reductions for prior year tax positions	(1		)
Settlements	—
Reductions related to expirations of statute of limitations	(97		)
Balance at June 30, 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		)
Settlements	—
Reductions related to expirations of statute of limitations	(1,510		)
Balance at June 30, 2015	$	7,104