Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Related Party Transactions [Abstract]
Revenue from sales to related parties	$ 0.2	$ 1.1	$ 1.8
Expenses related to purchases from related parties	1.3	2.0	$ 1.4
Accounts payable to related parties	$ 0.1	$ 0.1

Amount for accounts payable to related parties.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant