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Borrowings (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Jun. 30, 2023 | Sep. 01, 2022 | Feb. 28, 2017
BORROWINGS |  |  |  |  |  |  |
Borrowings outstanding | $ 349,000,000 |  | $ 349,000,000 |  | $ 215,000,000 |  |
Revolving credit facility |  |  |  |  |  |  |
BORROWINGS |  |  |  |  |  |  |
Unused commitment fee (as a percent) |  |  | 0.10% |  |  |  |
Borrowings outstanding | 349,000,000.0 |  | $ 349,000,000.0 |  |  |  |
Available credit facility | 176,300,000 |  | 176,300,000 |  |  |  |
Revolving credit facility | Minimum |  |  |  |  |  |  |
BORROWINGS |  |  |  |  |  |  |
Maximum borrowing capacity | 600,000,000 |  | $ 600,000,000 |  |  |  |
Unused commitment fee (as a percent) |  |  | 0.10% |  |  |  |
Revolving credit facility | Maximum |  |  |  |  |  |  |
BORROWINGS |  |  |  |  |  |  |
Maximum borrowing capacity | 300,000,000 |  | $ 300,000,000 |  |  |  |
Increase in the credit agreement's borrowing capacity available under certain circumstances | 250,000,000 |  | $ 250,000,000 |  |  |  |
Unused commitment fee (as a percent) |  |  | 0.25% |  |  |  |
Revolving credit facility | LIBOR |  |  |  |  |  |  |
BORROWINGS |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  | 1.00% |  |  |  |
Revolving credit facility | LIBOR | Minimum |  |  |  |  |  |  |
BORROWINGS |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  | 1.00% |  |  |  |
Revolving credit facility | LIBOR | Maximum |  |  |  |  |  |  |
BORROWINGS |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  | 1.75% |  |  |  |
Letters of credit sub facility |  |  |  |  |  |  |
BORROWINGS |  |  |  |  |  |  |
Amount outstanding under letters of credit | 74,700,000 |  | $ 74,700,000 |  |  |  |
Term Loan |  |  |  |  |  |  |
BORROWINGS |  |  |  |  |  |  |
Borrowings outstanding | 137,500,000 |  | 137,500,000 |  |  |  |
1.25% Convertible Senior Notes Due 2022 |  |  |  |  |  |  |
BORROWINGS |  |  |  |  |  |  |
Total interest expense |  |  |  | $ 700,000 |  |  |
Principal amount |  |  |  |  |  |  | $ 287,500,000
Principal value of notes repurchased and cancelled |  |  |  |  |  | $ 242,300,000 |
Contractual interest expense |  |  |  | 500,000 |  |  |
Amortization of debt issuance costs |  |  |  | 200,000 |  |  |
Lines-of-credit |  |  |  |  |  |  |
BORROWINGS |  |  |  |  |  |  |
Amount outstanding under letters of credit | 54,500,000 |  | 54,500,000 |  |  |  |
Available credit facility | 21,400,000 |  | 21,400,000 |  |  |  |
Credit facility and delayed draw term loan |  |  |  |  |  |  |
BORROWINGS |  |  |  |  |  |  |
Total interest expense | $ 8,100,000 | $ 5,900,000 | $ 21,500,000 | $ 12,900,000 |  |  |

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