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Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Mar. 31, 2018
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable, Billed | $ 188,915 | $ 184,536
Accounts receivable, Unbilled | 81,592 | 85,156
Allowance for doubtful accounts | (1,704) | (2,027)
Accounts receivable, net | 268,803 | 267,665
Inventories: |  |
Raw materials | 74,995 | 62,252
Work in process | 51,704 | 47,465
Finished goods | 105,379 | 86,590
Inventories | 232,078 | 196,307
Prepaid expenses and other current assets: |  |
Prepaid expenses | 80,984 | 68,516
Insurance receivable | 133,020 |
Other | 19,254 | 8,619
Prepaid expenses and other current assets | 233,258 | 77,135
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 217,090 | 219,137
Less: accumulated amortization | (191,018) | (187,275)
Other acquired intangible assets, net | 26,072 | 31,862
Other assets: |  |
Investment in unconsolidated affiliate | 160,559 | 163,835
Deferred income taxes | 255,292 | 222,274
Capitalized software costs, net | 244,729 | 246,792
Patents, orbital slots and other licenses, net | 16,800 | 16,100
Other | 67,360 | 37,133
Other assets | 744,740 | 686,134
Accrued liabilities: |  |
Collections in excess of revenues and deferred revenues | 108,977 | 121,439
Accrued employee compensation | 28,614 | 46,106
Accrued vacation | 40,032 | 39,022
Warranty reserve, current portion | 5,196 | 5,357
Other | 67,588 | 51,752
Accrued liabilities | 250,407 | 263,676
Other liabilities: |  |
Deferred revenues, long-term portion | 81,740 | 77,831
Deferred rent, long-term portion | 15,378 | 13,769
Warranty reserve, long-term portion | 1,712 | 1,557
Satellite performance incentive obligations, long-term portion | 25,465 | 18,181
Other | 5,971 | 9,902
Other liabilities | 130,266 | 121,240
Technology [Member] |  |
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 89,094 | 90,652
Contracts and Customer Relationships [Member] |  |
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 103,421 | 103,808
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 | 10,035 | 10,137
Satellites, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 1,536,410 | 1,613,935
Less: accumulated depreciation and amortization | (412,336) | (373,948)
Property and equipment, net | 1,124,074 | 1,239,987
Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 1,604,973 | 1,442,398
Less: accumulated depreciation and amortization | (778,674) | (719,910)
Property and equipment, net | 826,299 | 722,488
Satellites [Member] | Satellites, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 978,098 | 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 | 459,222 | 362,342
Construction in Progress [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 158,173 | 108,192
Equipment and Software [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 939,026 | 864,140
CPE Leased Equipment [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 341,308 | 298,746
Less: accumulated depreciation and amortization | (133,200) | (129,000)
Furniture and Fixtures [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 39,952 | 35,234
Leasehold Improvements [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 115,300 | 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

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