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Stockholders' Equity - Additional Information (Detail) - $ / shares | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 25, 2019 | Dec. 31, 2018 | Jan. 31, 2019
Equity Class Of Treasury Stock [Line Items] |  |  |
Repurchase of shares |  | 2,189,100 |
Shares repurchased average price |  | $ 87.62 |
Subsequent Event [Member] |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |
Repurchase of shares | 340,000 |  |
Shares repurchased average price | $ 64.94 |  |
Stock repurchase remaining number of shares authorized to be repurchased |  |  | 1,660,328

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