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Share Repurchase Programs (Detail) - USD ($) | 11 Months Ended | 12 Months Ended | 47 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2018 | Aug. 31, 2017 | Aug. 31, 2014
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 50,000,000
Purchase of common stock, shares |  |  |  |  | 1,316,587 |  |
Purchase of Treasury Stock |  | $ 49,875,000 |  | $ 6,284,000 | $ 19,000,000 |  |
Offering and Sale of Notes |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 50,000,000 |
Purchase of common stock, shares | 1,414,900 |  |  |  |  |  |
Purchase of Treasury Stock | $ 49,900,000 |  |  |  |  |  |
Program |  |  |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |  |  |
Purchase of common stock, shares |  | 0 | 0 | 380,538 |  |  |
Purchase of Treasury Stock |  |  |  | $ 6,300,000 |  |  |

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