Contingencies and Certain Matters Resolved During Fiscal Year 2015 - Additional Information 1 (Detail) - USD ($) $ in Thousands		12 Months Ended
	Sep. 05, 2014	Mar. 31, 2017	Mar. 31, 2016	Apr. 03, 2015
Gain Contingencies [Line Items]
Litigation settlement amount	$ 108,712
Proceeds from legal settlement		$ 27,500	$ 27,500	$ 53,700
Product revenues		713,936	664,821	728,074
Interest income		700	2,200	2,000
Implied License [Member]
Gain Contingencies [Line Items]
Litigation settlement amount	$ 85,132
Satellite Services [Member] | Operating Segments [Member]
Gain Contingencies [Line Items]
Product revenues		27,711	25,606	33,576
Satellite Services [Member] | Operating Segments [Member] | Implied License [Member]
Gain Contingencies [Line Items]
Product revenues		$ 26,800	$ 25,300	33,000
Selling, General and Administrative Expenses [Member] | Satellite Services [Member] | Operating Segments [Member]
Gain Contingencies [Line Items]
Litigation settlement amount				$ 18,700