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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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Number of shares that have been repurchased and retired during the period.

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