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Long-Term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Jun. 30, 2020
--- | --- | ---
Long-term Debt Current and Noncurrent |  |
Long-term Debt, Including Current Maturities | $ 598,306 | $ 598,204
Debt Issuance Costs, Net | (6,198) | (4,121)
Long-term Debt, Current Maturities [Abstract] |  |
Long-term Debt, Less Current Maturities | 592,108 | 594,083
2.650% Senior Notes due 2020 [Member] |  |
Long-term Debt Current and Noncurrent |  |
Long-term Debt | 299,823 | 0
3.875% Senior Unsecured Notes Due in 2022 [Member] |  |
Long-term Debt Current and Noncurrent |  |
Long-term Debt | 0 | 299,940
Long-term Debt, Current Maturities [Abstract] |  |
Debt Instrument, Unamortized Discount |  | 100
4.625% Senior Unsecured Notes Due in 2028 |  |
Long-term Debt Current and Noncurrent |  |
Long-term Debt | 298,483 | 298,264
Long-term Debt, Current Maturities [Abstract] |  |
Debt Instrument, Unamortized Discount | 1,500 | $ 1,700
Two Point Eight Percent Senior Unsecured Notes Due In Two Thousand And Thirty One |  |
Long-term Debt, Current Maturities [Abstract] |  |
Debt Instrument, Unamortized Discount | $ 200 |

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