Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Apr. 03, 2015
Revenues:
Product revenues	$ 713,936	$ 664,821	$ 728,074
Service revenues	845,401	752,610	654,461
Total revenues	1,559,337	1,417,431	1,382,535
Operating profits (losses):
Income from operations	36,459	41,119	83,144
Amortization of acquired intangible assets	(10,788)	(16,438)	(17,966)
Operating Segments [Member]
Operating profits (losses):
Income from operations	47,247	57,557	101,110
Operating Segments [Member] | Satellite Services [Member]
Revenues:
Product revenues	27,711	25,606	33,576
Service revenues	601,936	533,628	466,284
Total revenues	629,647	559,234	499,860
Operating profits (losses):
Income from operations	131,085	81,830	62,379
Amortization of acquired intangible assets	(5,866)	(9,122)	(11,058)
Operating Segments [Member] | Commercial Networks [Member]
Revenues:
Product revenues	211,458	228,694	331,052
Service revenues	33,149	22,042	16,078
Total revenues	244,607	250,736	347,130
Operating profits (losses):
Income from operations	(180,496)	(111,339)	(33,616)
Amortization of acquired intangible assets	(1,679)	(2,569)	(1,452)
Operating Segments [Member] | Government Systems [Member]
Revenues:
Product revenues	474,767	410,521	363,446
Service revenues	210,316	196,940	172,099
Total revenues	685,083	607,461	535,545
Operating profits (losses):
Income from operations	96,658	87,066	72,347
Amortization of acquired intangible assets	(3,243)	(4,747)	(5,456)
Material Reconciling Items [Member]
Operating profits (losses):
Amortization of acquired intangible assets	$ (10,788)	$ (16,438)	$ (17,966)