Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Jan. 02, 2015	Dec. 31, 2015	Jan. 02, 2015
Revenues:
Product revenues	$ 156,290	$ 174,299	$ 488,298	$ 536,352
Service revenues	191,469	165,254	557,169	481,430
Total revenues	347,759	339,553	1,045,467	1,017,782
Operating profits (losses):
Income (loss) from operations	10,385	18,178	33,625	63,465
Amortization of acquired intangible assets	(4,261)	(4,651)	(13,658)	(13,338)
Satellite Services [Member]
Operating profits (losses):
Amortization of acquired intangible assets	(2,488)	(2,765)	(8,018)	(8,295)
Commercial Networks [Member]
Operating profits (losses):
Amortization of acquired intangible assets	(706)	(369)	(1,957)	(1,084)
Government Systems [Member]
Operating profits (losses):
Amortization of acquired intangible assets	(1,067)	(1,517)	(3,683)	(3,959)
Operating Segments [Member]
Operating profits (losses):
Income (loss) from operations	14,646	22,829	47,283	76,803
Operating Segments [Member] | Satellite Services [Member]
Revenues:
Product revenues	6,453	6,149	19,105	27,468
Service revenues	134,751	117,683	394,700	342,015
Total revenues	141,204	123,832	413,805	369,483
Operating profits (losses):
Income (loss) from operations	21,772	10,421	59,849	47,823
Operating Segments [Member] | Commercial Networks [Member]
Revenues:
Product revenues	49,617	79,832	173,111	251,533
Service revenues	5,809	4,178	15,440	11,564
Total revenues	55,426	84,010	188,551	263,097
Operating profits (losses):
Income (loss) from operations	(29,889)	(7,558)	(70,928)	(20,801)
Operating Segments [Member] | Government Systems [Member]
Revenues:
Product revenues	100,220	88,318	296,082	257,351
Service revenues	50,909	43,393	147,029	127,851
Total revenues	151,129	131,711	443,111	385,202
Operating profits (losses):
Income (loss) from operations	22,763	19,966	58,362	49,781
Material Reconciling Items [Member]
Operating profits (losses):
Amortization of acquired intangible assets	$ (4,261)	$ (4,651)	$ (13,658)	$ (13,338)