Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Apr. 01, 2018	Mar. 31, 2018
Accounts receivable, net:
Accounts receivable, Billed	$ 218,276		$ 184,536
Accounts receivable, Unbilled	83,743	$ 79,492	85,156
Allowance for doubtful accounts	(1,712)		(2,027)
Accounts receivable, net	300,307		267,665
Inventories:
Raw materials	77,834		62,252
Work in process	52,084		47,465
Finished goods	104,600		86,590
Inventories	234,518		196,307
Prepaid expenses and other current assets:
Prepaid expenses	72,369		68,516
Other	18,277		8,619
Prepaid expenses and other current assets	90,646		77,135
Other assets:
Investment in unconsolidated affiliate	160,711		163,835
Deferred income taxes	258,834		222,274
Capitalized software costs, net	244,368		246,792
Patents, orbital slots and other licenses, net	23,059		16,100
Other	71,833		37,133
Other assets	758,805		686,134
Accrued liabilities:
Collections in excess of revenues and deferred revenues	125,540	127,355	121,439
Accrued employee compensation	56,454		46,106
Accrued vacation	43,077		39,022
Warranty reserve, current portion	5,877		5,357
Other	77,320		51,752
Accrued liabilities	308,268		263,676
Other liabilities:
Deferred revenue, long-term portion	71,230	$ 77,831	77,831
Deferred rent, long-term portion	16,810		13,769
Warranty reserve, long-term portion	1,707		1,557
Satellite performance incentive obligation, long-term portion	25,324		18,181
Other	5,755		9,902
Other liabilities	120,826		121,240
Satellites, Net [Member]
Property and equipment, net:
Property and equipment	1,667,208		1,613,935
Less: accumulated depreciation and amortization	(451,545)		(373,948)
Property and equipment, net	1,215,663		1,239,987
Property and Equipment, Net [Member]
Property and equipment, net:
Property and equipment	1,752,248		1,442,398
Less: accumulated depreciation and amortization	(842,621)		(719,910)
Property and equipment, net	909,627		722,488
Satellites [Member] | Satellites, Net [Member]
Property and equipment, net:
Property and equipment	978,118		1,152,503
Capital Lease of Satellite Capacity - Anik F2 [Member] | Satellites, Net [Member]
Property and equipment, net:
Property and equipment	99,090		99,090
Construction in Progress [Member] | Satellites, Net [Member]
Property and equipment, net:
Property and equipment	590,000		362,342
Construction in Progress [Member] | Property and Equipment, Net [Member]
Property and equipment, net:
Property and equipment	167,178		108,192
Equipment and Software [Member] | Property and Equipment, Net [Member]
Property and equipment, net:
Property and equipment	1,027,293		864,140
CPE Leased Equipment [Member] | Property and Equipment, Net [Member]
Property and equipment, net:
Property and equipment	373,357		298,746
Less: accumulated depreciation and amortization	(142,600)		(129,000)
Furniture and Fixtures [Member] | Property and Equipment, Net [Member]
Property and equipment, net:
Property and equipment	46,678		35,234
Leasehold Improvements [Member] | Property and Equipment, Net [Member]
Property and equipment, net:
Property and equipment	126,528		111,841
Building [Member] | Property and Equipment, Net [Member]
Property and equipment, net:
Property and equipment	8,923		8,923
Land [Member] | Property and Equipment, Net [Member]
Property and equipment, net:
Property and equipment	$ 2,291		$ 15,322