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Post-Retirement Benefits - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Compensation And Retirement Disclosure [Abstract] |  |  |  |
Contributions to the Compensation Plan by the employer | $ 0.8 | $ 0.9 | $ 2.4 | $ 2.8
Contributions to the Compensation Plan by the employer in remainder of fiscal year 2018 | $ 0.8 |  | $ 0.8 |

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