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Stockholders' Equity - Additional Information (Detail) - $ / shares | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 26, 2018 | Sep. 30, 2018 | Oct. 31, 2018
Equity Class Of Treasury Stock [Line Items] |  |  |
Repurchase of shares |  | 1,239,100 |
Shares repurchased average price |  | $ 98.77 |
Subsequent Event [Member] |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |
Repurchase of shares | 300,000 |  |
Shares repurchased average price | $ 80.15 |  |
Stock repurchase remaining number of shares authorized to be repurchased |  |  | 2,650,328

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