Estimated Fair Values of the Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015	Jul. 01, 2014
Acquired assets:
Goodwill	$ 32,243	$ 31,534
Long-term deferred tax assets	$ 45,206	$ 45,206
ECP
Acquired assets:
Cash and cash equivalents			$ 53
Accounts receivable			25
Property and equipment			619
In-process research and development			18,500
Goodwill			1,964
Long-term deferred tax assets			1,874
Other assets acquired			141
Total assets acquired			23,176
Liabilities assumed:
Accounts payable			295
Accrued liabilities			131
Long-term deferred tax liabilities			1,000
Total liabilities assumed			1,426
Net assets acquired			$ 21,750