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Income Taxes - Reconciliation of Effective Tax Rates (Details) | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 21.00% | 21.00% | 21.00%
State income taxes | 3.20% | 4.00% | 3.80%
Kansas HPIP credit | (0.50%) | (0.90%) | (1.50%)
Non-qualified stock option exercises | (3.60%) | (0.50%) | 0.00%
Other | 0.90% | 0.00% | 0.00%
Effective income tax rate | 21.00% | 23.60% | 23.30%

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