Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Summary Of Significant Accounting Policy [Line Items]
Product warranty period	1 year
Reclassifications out of accumulated other comprehensive income (loss)	$ 0	$ 0	$ 0
Expected dividend yield	0.00%
Stock Options and Performance Shares
Summary Of Significant Accounting Policy [Line Items]
Shares excluded from the calculation of diluted weighted average shares outstanding	24,000	62,000	2,000
Leasehold Improvements
Summary Of Significant Accounting Policy [Line Items]
Leasehold improvements, useful life	shorter of the lease term or the estimated useful lives
Minimum | Machinery and Equipment
Summary Of Significant Accounting Policy [Line Items]
Property and Equipment, useful life	3 years
Minimum | Computer Software
Summary Of Significant Accounting Policy [Line Items]
Property and Equipment, useful life	3 years
Minimum | Furniture and Fixtures
Summary Of Significant Accounting Policy [Line Items]
Property and Equipment, useful life	3 years
Minimum | Building and Building Improvements
Summary Of Significant Accounting Policy [Line Items]
Property and Equipment, useful life	7 years
Maximum | Machinery and Equipment
Summary Of Significant Accounting Policy [Line Items]
Property and Equipment, useful life	5 years
Maximum | Computer Software
Summary Of Significant Accounting Policy [Line Items]
Property and Equipment, useful life	5 years
Maximum | Furniture and Fixtures
Summary Of Significant Accounting Policy [Line Items]
Property and Equipment, useful life	5 years
Maximum | Building and Building Improvements
Summary Of Significant Accounting Policy [Line Items]
Property and Equipment, useful life	33 years