Balance Sheet Components - Components of Certain Balance Sheet Liability Amounts (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Accrued and other current liabilities:
Accrued personnel expenses	$ 73,124	$ 88,346
Indirect customer incentive programs	69,921	36,409
Warranty accrual	15,640	13,424
Employee benefit plan obligation	2,164	1,266
Income taxes payable	4,387	6,232
Contingent consideration for business acquisition - current portion	0	2,889
Other current liabilities	112,819	83,707
Accrued and other current liabilities	278,055	232,273
Other non-current liabilities:
Warranty accrual	10,624	8,487
Obligation for deferred compensation plan	17,998	15,043
Employee benefit plan obligation	43,110	41,998
Deferred tax liability	1,789	1,789
Contingent consideration for business acquisition - non-current portion	0	7,019
Other non-current liabilities	8,483	9,355
Non-current liabilities	$ 82,004	$ 83,691