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Income Taxes Income Taxes (Tables)
12 Months Ended
Jun. 30, 2023
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,
 202320222021
Current:   
Federal$125,622 $59,390 $55,598 
State30,505 18,089 13,897 
Deferred: 
Federal(40,218)24,391 14,401 
State(7,981)7,481 2,360 
 $107,928 $109,351 $86,256 
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,
 20232022
Deferred tax assets:  
Contract and service revenues$18,186 $15,340 
Expense reserves and accruals (bad debts, compensation, and payroll tax)14,023 15,382 
Leasing liabilities12,462 12,868 
Net operating loss and tax credit carryforwards1,965 2,107 
Other, net2,916 3,311 
Total gross deferred tax assets49,552 49,008 
Valuation allowance(125)(200)
Net deferred tax assets49,427 48,808 
Deferred tax liabilities:  
Property and equipment depreciation(27,788)(33,390)
Intangibles, software development, and research and development tax amortization(136,045)(192,187)
Contract and service costs(119,201)(104,139)
Leasing right-of-use assets(10,824)(11,722)
Total gross deferred liabilities(293,858)(341,438)
Net deferred tax liability$(244,431)$(292,630)
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,
202320222021
Computed "expected" tax expense21.0 %21.0 %21.0 %
Increase (reduction) in taxes resulting from:   
State income taxes, net of federal income tax benefits3.7 %4.3 %3.2 %
Research and development credit(2.3)%(2.0)%(2.4)%
Other (net)0.3 %(0.1)%(0.1)%
 22.7 %23.2 %21.7 %
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, 2023, 2022, and 2021, follows:
 Unrecognized Tax Benefits
Balance at July 1, 2020$10,112 
Additions for current year tax positions1,598 
Additions for prior year tax positions490 
Reductions for prior year tax positions(30)
Reductions related to expirations of statute of limitations(3,408)
Balance at June 30, 20218,762 
Additions for current year tax positions1,863 
Additions for prior year tax positions1,642 
Reductions for prior year tax positions(36)
Reductions related to expirations of statute of limitations(3,241)
Balance at June 30, 20228,990 
Additions for current year tax positions2,570 
Additions for prior year tax positions2,433 
Reductions for prior year tax positions(350)
Reductions related to expirations of statute of limitations(1,638)
Balance at June 30, 2023$12,005