Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Accounting Policies [Abstract]
Deferred revenue on shipments to distributors	$ 267,200	$ 260,900
Deferred cost of sales on shipments to distributors	83,800	94,800
Deferred income on shipments to distributors	183,432	166,128
Property, Plant and Equipment [Line Items]
Amount of distributor advances, included in deferred income on shipments to distributors in consolidated balance sheets	$ 102,900	$ 116,000
Number of days requiring distributor to settle receivable balances (in days)	30
Minimum | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Minimum | Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Maximum | Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years