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Debt - Narrative (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2018
Long-term debt outstanding |  |  |  |  |
Aggregate maturities of long-term debt, 2019 |  | $ 0 |  |  |
Aggregate maturities of long-term debt, 2020 |  | 0 |  |  |
Aggregate maturities of long-term debt, 2021 |  | 0 |  |  |
Aggregate maturities of long-term debt, 2022 |  | 250,000,000 |  |  |
Aggregate maturities of long-term debt, 2023 |  | 300,000,000 |  |  |
Interest costs |  | 31,100,000 | $ 31,100,000 | $ 29,900,000 |
Interest costs, capitalized |  | 2,800,000 | $ 1,300,000 | $ 1,900,000 |
Credit Agreement |  |  |  |  |
Long-term debt outstanding |  |  |  |  |
Maximum borrowing capacity | $ 400,000,000.0 |  |  |  |
Letters of credit issued |  | 6,000,000 |  |  |
Credit Agreement available for future borrowings |  | $ 394,000,000 |  |  |
Credit Agreement | LIBOR |  |  |  |  |
Long-term debt outstanding |  |  |  |  |
Interest rate margin |  | 1.50% |  |  |
Credit Agreement | LIBOR | Minimum |  |  |  |  |
Long-term debt outstanding |  |  |  |  |
Interest rate margin | 1.00% |  |  |  |
Credit Agreement | LIBOR | Maximum |  |  |  |  |
Long-term debt outstanding |  |  |  |  |
Interest rate margin | 1.75% |  |  |  |
Credit Agreement | Base Rate |  |  |  |  |
Long-term debt outstanding |  |  |  |  |
Interest rate margin |  | 0.50% |  |  |
Credit Agreement | Base Rate | Minimum |  |  |  |  |
Long-term debt outstanding |  |  |  |  |
Interest rate margin | 0.00% |  |  |  |
Credit Agreement | Base Rate | Maximum |  |  |  |  |
Long-term debt outstanding |  |  |  |  |
Interest rate margin | 0.75% |  |  |  |
Letter of Credit |  |  |  |  |
Long-term debt outstanding |  |  |  |  |
Commitment fee rate |  | 0.275% |  |  |
Letter of credit fees |  | 1.50% |  |  |
Required interest coverage ratio | 3.50 |  |  |  |
Letter of Credit | Minimum |  |  |  |  |
Long-term debt outstanding |  |  |  |  |
Commitment fee rate | 0.125% |  |  |  |
Letter of credit fees | 1.00% |  |  |  |
Letter of Credit | Maximum |  |  |  |  |
Long-term debt outstanding |  |  |  |  |
Commitment fee rate | 0.40% |  |  |  |
Letter of credit fees | 1.75% |  |  |  |
Required debt to capital ratio |  |  |  |  | 0.55

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