Income Taxes Income Taxes (Tables)

12 Months Ended

Jun. 30, 2014

Income Tax Disclosure [Abstract]

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

	Year Ended June 30,
	2014		2013		2012
Current:
Federal	$	77,938	$	54,574	$	48,053
State	10,166		4,540		6,022
Deferred:
Federal	18,400		19,553		20,649
State	3,631		4,538		1,960
	$	110,135	$	83,205	$	76,684

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

	2014			2013
Deferred income taxes (current)	$	(37,592	)	$	(30,845	)
Deferred income taxes (long-term)	(134,918		)	(120,434		)
	$	(172,510	)	$	(151,279	)

	June 30,
	2014			2013
Deferred tax assets:
Deferred revenue	$	4,996		$	5,846
Expense reserves (bad debts, insurance, franchise tax and vacation)	14,776			12,515
Net operating loss carryforwards	4,218			6,363
Other, net	1,122			1,383
	25,112			26,107
Deferred tax liabilities:
Accelerated tax depreciation	(29,247		)	(35,046		)
Accelerated tax amortization	(125,054		)	(106,147		)
Prepaid expenses	(29,264		)	(25,779		)
Other, net	(13,357		)	(9,714		)
	(196,922		)	(176,686		)
Net deferred tax liability before valuation allowance	(171,810		)	(150,579		)
Valuation allowance	(700		)	(700		)
Net deferred tax liability	$	(172,510	)	$	(151,279	)

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

	Year Ended June 30,
	2014		2013		2012
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	2.9	%	2.3	%	2.2	%
Research and development credit	(0.7	)%	(3.3	)%	(1.8	)%
Domestic production activities deduction	(2.1	)%	(2.2	)%	(2.1	)%
Other (net)	0.3	%	0.2	%	(0.2	)%
	35.4	%	32.0	%	33.1	%

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

	Unrecognized Tax Benefits
Balance at July 1, 2012	$	6,202
Additions for current year tax positions	1,087
Reductions for current year tax positions	—
Additions for prior year tax positions	510
Reductions for prior year tax positions	(2,720		)
Settlements	—
Reductions related to expirations of statute of limitations	(189		)
Balance at June 30, 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