Inventories - Additional Information (Detail) - USD ($) $ in Millions	Sep. 29, 2018	Mar. 31, 2018
Inventory Disclosure [Abstract]
Reserves for obsolete inventory	$ 3.6	$ 3.5

Amount of valuation reserve for inventory.

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