Segment Information - Amortization of Acquired Intangibles by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Sep. 28, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Amortization of acquired intangible assets	$ 4,041	$ 4,767	$ 8,105	$ 9,539
Satellite Services [Member]
Segment Reporting Information [Line Items]
Amortization of acquired intangible assets	3,238	3,238	6,476	6,476
Commercial Networks [Member]
Segment Reporting Information [Line Items]
Amortization of acquired intangible assets	177	884	361	1,767
Government Systems [Member]
Segment Reporting Information [Line Items]
Amortization of acquired intangible assets	$ 626	$ 645	$ 1,268	$ 1,296