Stockholders' Equity - Additional Information (Detail)	6 Months Ended
Sep. 30, 2019 $ / shares shares
Equity [Abstract]
Repurchase of shares	3,574,109
Shares repurchased average price \| $ / shares	$ 87.82
Stock repurchase remaining number of shares authorized to be repurchased	7,305,649

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Publisher FASB
-Name Accounting Standards Codification
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration