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Segment Information - Segment Revenues and Operating (Losses) Profits (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 02, 2015	Jan. 03, 2014	Jan. 02, 2015	Jan. 03, 2014
Segment Reporting Information [Line Items]
Product revenue	$ 174,299us-gaap_SalesRevenueGoodsNet	$ 193,846us-gaap_SalesRevenueGoodsNet	$ 536,352us-gaap_SalesRevenueGoodsNet	$ 586,398us-gaap_SalesRevenueGoodsNet
Income (loss) from operations	18,178us-gaap_OperatingIncomeLoss	1,524us-gaap_OperatingIncomeLoss	63,465us-gaap_OperatingIncomeLoss	4,438us-gaap_OperatingIncomeLoss
Implied license [Member] \| Satellite Services [Member]
Segment Reporting Information [Line Items]
Product revenue	6,000		27,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	22,829	5,176	76,803	15,387
Operating Segments [Member] \| Satellite Services [Member]
Segment Reporting Information [Line Items]
Product revenue	6,149	11	27,468	31
Income (loss) from operations	10,421	(9,761)	47,823	(37,377)
Operating Segments [Member] \| Implied license [Member] \| Satellite Services [Member]
Segment Reporting Information [Line Items]
Product revenue	6,000		27,000
Operating Segments [Member] \| Implied license and other damages [Member] \| Satellite Services [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	$ 6,000		$ 45,700