Segment Information - Segment Revenues and Operating Profits (Losses) (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Oct. 03, 2014	Sep. 30, 2015	Oct. 03, 2014
Segment Reporting Information [Line Items]
Product revenues	$ 163,660	$ 193,924	$ 332,008	$ 362,053
Income (loss) from operations	13,826	46,456	23,240	45,287
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	18,413	51,114	32,637	53,974
Satellite Services [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Product revenues	6,376	21,289	12,652	21,319
Income (loss) from operations	21,036	39,351	38,077	37,402
Implied license [Member] | Satellite Services [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Product revenues	6,300	21,000	12,500	21,000
Implied license and other damages [Member] | Satellite Services [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	$ 6,300	$ 39,700	$ 12,500	$ 39,700