The Company and Summary of Significant Accounting Policies- Advertising and Research and Development (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Accounting Policies [Abstract]
Research and development expense	$ 21,256	$ 22,176	$ 20,872
Marketing and advertising expense	109,579	109,738	$ 111,162
Prepaid advertising	$ 900	$ 1,084