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Income Taxes Income Taxes (Tables)
12 Months Ended
Jun. 30, 2020
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,
 202020192018
Current:   
Federal$46,137 $54,800 $56,060 
State13,690 12,946 9,948 
Deferred: 
Federal21,130 4,177 (80,509)
State3,451 3,427 5,625 
 $84,408 $75,350 $(8,876)
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,
 20202019
Deferred tax assets:  
Contract and service revenues$14,469 $13,450 
Expense reserves (bad debts, compensation, and payroll tax)14,096 14,325 
Leasing liabilities17,122  
Net operating loss and tax credit carryforwards3,786 2,713 
Other, net2,327 851 
Total gross deferred tax assets51,800 31,339 
Valuation allowance(473)(415)
Net deferred tax assets51,327 30,924 
Deferred tax liabilities:  
Accelerated tax depreciation(39,619)(31,846)
Accelerated tax amortization(166,343)(154,633)
Contract and service costs(73,331)(61,455)
Leasing right-of-use assets(16,032) 
Total gross deferred liabilities(295,325)(247,934)
Net deferred tax liability$(243,998)$(217,010)
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,
202020192018
Computed "expected" tax expense21.0 %21.0 %28.1 %
Increase (reduction) in taxes resulting from:   
State income taxes, net of federal income tax benefits3.6 %3.7 %2.9 %
Research and development credit(2.4)%(2.5)%(2.0)%
Domestic production activities deduction % %(1.4)%
TCJA deferred tax rate re-measurement % %(30.0)%
Tax effects of share-based payments(0.1)%(1.4)%(0.8)%
Other (net) %0.9 %0.7 %
 22.1 %21.7 %(2.5)%
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, 2020 and 2019 follows:
 Unrecognized Tax Benefits
Balance at July 1, 2018$10,227 
Additions for current year tax positions1,135 
Reductions for current year tax positions(40)
Additions for prior year tax positions562 
Reductions for prior year tax positions(531)
Additions related to business combinations43 
Settlements(25)
Reductions related to expirations of statute of limitations(876)
Balance at June 30, 201910,495 
Additions for current year tax positions1,451 
Additions for prior year tax positions867 
Additions related to business combinations192 
Reductions related to expirations of statute of limitations(2,893)
Balance at June 30, 2020$10,112