Segment Information - Other Acquired Intangible Assets, Net and Goodwill Included in Segment Assets and Amortization of Acquired Intangible Assets by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Apr. 03, 2015
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	$ 41,677	$ 33,604
Goodwill	119,876	117,040
Amortization of acquired intangible assets	10,788	16,438	$ 17,966
Operating Segments [Member] | Satellite Services [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	21,843	8,751
Goodwill	13,579	9,809
Amortization of acquired intangible assets	5,866	9,122	11,058
Operating Segments [Member] | Commercial Networks [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	4,903	6,581
Goodwill	43,930	43,990
Amortization of acquired intangible assets	1,679	2,569	1,452
Operating Segments [Member] | Government Systems [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	14,931	18,272
Goodwill	62,367	63,241
Amortization of acquired intangible assets	$ 3,243	$ 4,747	$ 5,456