Common Stock and Stockholders' Equity - Schedule of Shares of Common Stock Reserved for Future Issuance (Detail) - shares shares in Thousands	Mar. 31, 2016	Mar. 31, 2015
Class of Stock [Line Items]
Shares of common stock reserved for future issuance	16,610	16,423
Restricted Stock Units [Member]
Class of Stock [Line Items]
Shares of common stock reserved for future issuance	1,549	723
Available for Future Stock Option and RSU Grants [Member]
Class of Stock [Line Items]
Shares of common stock reserved for future issuance	6,561	5,149
Available for Future Employee Stock Purchase Plan Awards [Member]
Class of Stock [Line Items]
Shares of common stock reserved for future issuance	1,360	1,000
Common Stock Options Outstanding [Member]
Class of Stock [Line Items]
Shares of common stock reserved for future issuance	7,050	9,422
Common Stock [Member]
Class of Stock [Line Items]
Shares of common stock reserved for future issuance	90	129