Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Apr. 01, 2019	Mar. 31, 2019
Accounts receivable, net:
Accounts receivable, Billed	$ 198,553		$ 218,276
Accounts receivable, Unbilled	97,645		83,743
Allowance for doubtful accounts	(2,131)		(1,712)
Accounts receivable, net	294,067		300,307
Inventories:
Raw materials	85,616		77,834
Work in process	55,493		52,084
Finished goods	128,408		104,600
Inventories	269,517		234,518
Prepaid expenses and other current assets:
Prepaid expenses	86,253		72,369
Other	18,751		18,277
Prepaid expenses and other current assets	105,004	$ 90,179	90,646
Property, equipment and satellites, net
Property, equipment and satellites, gross	3,769,176		3,419,456
Less: accumulated depreciation and amortization	(1,405,260)		(1,294,166)
Property and equipment, net	2,363,916		2,125,290
Other acquired intangible assets, net:
Other acquired intangible assets, gross	216,736		217,784
Less: accumulated amortization	(198,769)		(195,483)
Other acquired intangible assets, net	17,967		22,301
Other assets:
Investment in unconsolidated affiliate	162,096		160,711
Deferred income taxes	267,790		258,834
Capitalized software costs, net	242,273		244,368
Patents, orbital slots and other licenses, net	34,412		23,059
Other	82,043		71,833
Other assets	788,614		758,805
Accrued and other liabilities:
Collections in excess of revenues and deferred revenues	107,817		125,540
Accrued employee compensation	35,452		56,454
Accrued vacation	44,984		43,077
Warranty reserve, current portion	6,569		5,877
Operating lease liabilities	41,934
Other	93,255		77,320
Accrued and other liabilities	330,011	346,674	308,268
Other liabilities:
Deferred revenues, long-term portion	86,054		71,230
Deferred rent, long-term portion			16,810
Warranty reserve, long-term portion	3,148		1,707
Satellite performance incentive obligations, long-term portion	24,881		25,324
Other	4,741		5,755
Other liabilities	118,824	$ 104,115	120,826
Technology [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	89,142		89,972
Contracts and Customer Relationships [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	103,101		103,283
Satellite Co-Location Rights [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	8,600		8,600
Trade Name [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	5,940		5,940
Other [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	9,953		9,989
Satellites [Member]
Property, equipment and satellites, net
Property, equipment and satellites, gross	978,113		978,118
Satellites under Construction [Member]
Property, equipment and satellites, net
Property, equipment and satellites, gross	721,658		590,000
Equipment and Software [Member]
Property, equipment and satellites, net
Property, equipment and satellites, gross	1,129,678		1,027,293
CPE Leased Equipment [Member]
Property, equipment and satellites, net
Property, equipment and satellites, gross	383,858		373,357
Less: accumulated depreciation and amortization	(154,500)		(142,600)
Satellite Ka-band Capacity Obtained under Finance Leases [Member]
Property, equipment and satellites, net
Property, equipment and satellites, gross	171,801		99,090
Furniture and Fixtures [Member]
Property, equipment and satellites, net
Property, equipment and satellites, gross	51,761		46,678
Leasehold Improvements [Member]
Property, equipment and satellites, net
Property, equipment and satellites, gross	128,852		126,528
Building [Member]
Property, equipment and satellites, net
Property, equipment and satellites, gross	8,923		8,923
Land [Member]
Property, equipment and satellites, net
Property, equipment and satellites, gross	2,291		2,291
Construction in Progress [Member]
Property, equipment and satellites, net
Property, equipment and satellites, gross	$ 192,241		$ 167,178