Segment Information - Segment Revenues and Operating Profits (Losses) (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jul. 04, 2014
Segment Reporting Information [Line Items]
Product revenues	$ 168,348	$ 168,129
Income (loss) from operations	9,414	(1,169)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	14,224	2,860
Operating Segments [Member] | Satellite Services [Member]
Segment Reporting Information [Line Items]
Product revenues	6,276	30
Income (loss) from operations	17,041	$ (1,949)
Operating Segments [Member] | Implied license [Member] | Satellite Services [Member]
Segment Reporting Information [Line Items]
Product revenues	6,200
Operating Segments [Member] | Implied license and other damages [Member] | Satellite Services [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	$ 6,200