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Goodwill and In-Process Research and Development - Additional Information (Detail) - USD ($)	Jul. 01, 2014	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Jul. 31, 2014
Goodwill [Line Items]
Goodwill		$ 31,045,000	$ 33,003,000	$ 31,534,000
Accumulated impairment loss, goodwill		0
In-process research and development		$ 14,482,000	$ 15,396,000	$ 14,711,000
ECP Entwicklungsgesellschaft mbH
Goodwill [Line Items]
In-process research and development					$ 18,500,000
Fair value inputs, discount rate	21.50%