Income Taxes Income Taxes (Tables)

12 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

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

The provision for income taxes consists of the following:

	Year Ended June 30,
	2018			2017		2016
Current:
Federal	$	56,060		$	80,752	$	66,574
State	9,948			9,469		7,571
Deferred:
Federal	(58,943		)	25,756		34,355
State	7,299			5,184		3,169
	$	14,364		$	121,161	$	111,669

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,
	2018			2017
Deferred tax assets:
Contract and service revenues	$	18,606		$	54,908
Expense reserves (bad debts, insurance, franchise tax and vacation)	11,164			14,648
Net operating loss and tax credit carryforwards	2,759			3,547
Other, net	2,711			2,119
Total gross deferred tax assets	35,240			75,222
Valuation allowance	(515		)	(357		)
Net deferred tax assets	34,725			74,865
Deferred tax liabilities:
Accelerated tax depreciation	(32,026		)	(36,994		)
Accelerated tax amortization	(141,274		)	(178,999		)
Contract and service costs	(51,038		)	(78,413		)
Total gross deferred liabilities	(224,338		)	(294,406		)
Net deferred tax liability	$	(189,613	)	$	(219,541	)

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,
	2018		2017		2016
Computed "expected" tax expense	28.1	%	35.0	%	35.0	%
Increase (reduction) in taxes resulting from:
State income taxes, net of federal income tax benefits	2.9	%	2.6	%	1.9	%
Research and development credit	(1.8	)%	(2.0	)%	(2.5	)%
Domestic production activities deduction	(1.2	)%	(2.1	)%	(1.9	)%
Tax over book basis in subsidiary stock	—	%	—	%	(1.7	)%
TCJA deferred tax rate re-measurement	(24.2	)%	—	%	—	%
Tax effects of share-based payments	(0.8	)%	(0.7	)%	—	%
Other (net)	0.7	%	0.2	%	0.2	%
	3.7	%	33.0	%	31.0	%

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 fiscal years ended June 30, 2018 and 2017 follows:

	Unrecognized Tax Benefits
Balance at July 1, 2016	$	7,421
Additions for current year tax positions	1,457
Reductions for current year tax positions	—
Additions for prior year tax positions	23
Reductions for prior year tax positions	(766		)
Settlements	(1,040		)
Reductions related to expirations of statute of limitations	(1,646		)
Balance at June 30, 2017	5,449
Additions for current year tax positions	2,157
Reductions for current year tax positions	—
Additions for prior year tax positions	3,130
Reductions for prior year tax positions	(55		)
Additions related to business combinations	510
Settlements	(161		)
Reductions related to expirations of statute of limitations	(803		)
Balance at June 30, 2018	$	10,227