Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Apr. 01, 2019	Mar. 31, 2019
Accounts receivable, net:
Accounts receivable, Billed	$ 220,068		$ 218,276
Accounts receivable, Unbilled	98,517		83,743
Allowance for doubtful accounts	(2,146)		(1,712)
Accounts receivable, net	316,439		300,307
Inventories:
Raw materials	81,483		77,834
Work in process	61,125		52,084
Finished goods	140,692		104,600
Inventories	283,300		234,518
Prepaid expenses and other current assets:
Prepaid expenses	84,297		72,369
Other	18,427		18,277
Prepaid expenses and other current assets	102,724	$ 90,179	90,646
Property, equipment and satellites, net
Property, equipment and satellites, gross	3,974,057		3,419,456
Less: accumulated depreciation and amortization	(1,461,044)		(1,294,166)
Property and equipment, net	2,513,013		2,125,290
Other acquired intangible assets, net:
Other acquired intangible assets, gross	217,651		217,784
Less: accumulated amortization	(201,380)		(195,483)
Other acquired intangible assets, net	16,271		22,301
Other assets:
Investment in unconsolidated affiliate	158,358		160,711
Deferred income taxes	275,657		258,834
Capitalized software costs, net	241,782		244,368
Patents, orbital slots and other licenses, net	39,056		23,059
Other	85,052		71,833
Other assets	799,905		758,805
Accrued and other liabilities:
Collections in excess of revenues and deferred revenues	120,275		125,540
Accrued employee compensation	59,395		56,454
Accrued vacation	45,030		43,077
Warranty reserve, current portion	5,845		5,877
Operating lease liabilities	42,829
Other	82,542		77,320
Accrued and other liabilities	355,916	346,674	308,268
Other liabilities:
Deferred revenues, long-term portion	83,423		71,230
Deferred rent, long-term portion			16,810
Warranty reserve, long-term portion	4,226		1,707
Satellite performance incentive obligations, long-term portion	24,642		25,324
Other	5,829		5,755
Other liabilities	118,120	$ 104,115	120,826
Technology [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	89,882		89,972
Contracts and Customer Relationships [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	103,251		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	9,978		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	839,420		590,000
Equipment and Software [Member]
Property, equipment and satellites, net
Property, equipment and satellites, gross	1,173,309		1,027,293
CPE Leased Equipment [Member]
Property, equipment and satellites, net
Property, equipment and satellites, gross	401,741		373,357
Less: accumulated depreciation and amortization	(160,400)		(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	53,002		46,678
Leasehold Improvements [Member]
Property, equipment and satellites, net
Property, equipment and satellites, gross	132,107		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	$ 213,350		$ 167,178