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

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