Goodwill and Purchased Intangibles Assets - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Change in carrying amount of goodwill			$ 0
Amortization expense	$ 300,000	$ 200,000	$ 500,000	$ 500,000