Income Taxes Income Taxes (Tables)

12 Months Ended

Jun. 30, 2019

Income Tax Disclosure [Abstract]

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

The provision/ (benefit) for income taxes consists of the following:

	Year Ended June 30,
	2019		2018			2017
Current:
Federal	$	54,800	$	56,060		$	80,752
State	12,946		9,948			9,469
Deferred:
Federal	4,177		(80,509		)	17,017
State	3,427		5,625			4,170
	$	75,350	$	(8,876	)	$	111,408

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,
	2019			2018
Deferred tax assets:
Contract and service revenues	$	13,450		$	—
Expense reserves (bad debts, insurance, franchise tax and vacation)	14,325			11,164
Net operating loss and tax credit carryforwards	2,713			2,759
Other, net	851			2,711
Total gross deferred tax assets	31,339			16,634
Valuation allowance	(415		)	(515		)
Net deferred tax assets	30,924			16,119
Deferred tax liabilities:
Accelerated tax depreciation	(31,846		)	(32,026		)
Accelerated tax amortization	(154,633		)	(141,274		)
Contract and service revenues	—			(5,067		)
Contract and service costs	(61,455		)	(46,055		)
Total gross deferred liabilities	(247,934		)	(224,422		)
Net deferred tax liability	$	(217,010	)	$	(208,303	)

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,
	2019		2018		2017
Computed "expected" tax expense	21.0	%	28.1	%	35.0	%
Increase (reduction) in taxes resulting from:
State income taxes, net of federal income tax benefits	3.7	%	2.9	%	2.6	%
Research and development credit	(2.5	)%	(2.0	)%	(2.1	)%
Domestic production activities deduction	—	%	(1.4	)%	(2.3	)%
TCJA deferred tax rate re-measurement	—	%	(30.0	)%	—	%
Tax effects of share-based payments	(1.4	)%	(0.8	)%	(0.8	)%
Other (net)	0.9	%	0.7	%	0.3	%
	21.7	%	(2.5	)%	32.7	%

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, 2019 and 2018 follows:

	Unrecognized Tax Benefits
Balance at July 1, 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
Additions for current year tax positions	1,135
Reductions for current year tax positions	(40		)
Additions for prior year tax positions	562
Reductions for prior year tax positions	(531		)
Additions related to business combinations	43
Settlements	(25		)
Reductions related to expirations of statute of limitations	(876		)
Balance at June 30, 2019	$	10,495