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Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable, Billed | $ 209,587 | $ 184,536
Accounts receivable, Unbilled | 87,085 | 85,156
Allowance for doubtful accounts | (1,347) | (2,027)
Accounts receivable, net | 295,325 | 267,665
Inventories: |  |
Raw materials | 78,850 | 62,252
Work in process | 52,240 | 47,465
Finished goods | 99,032 | 86,590
Inventories | 230,122 | 196,307
Prepaid expenses and other current assets: |  |
Prepaid expenses | 81,155 | 68,516
Insurance receivable | 12,317 |
Other | 22,372 | 8,619
Prepaid expenses and other current assets | 115,844 | 77,135
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 217,920 | 219,137
Less: accumulated amortization | (193,160) | (187,275)
Other acquired intangible assets, net | 24,760 | 31,862
Other assets: |  |
Investment in unconsolidated affiliate | 162,617 | 163,835
Deferred income taxes | 251,992 | 222,274
Capitalized software costs, net | 244,924 | 246,792
Patents, orbital slots and other licenses, net | 16,700 | 16,100
Other | 68,618 | 37,133
Other assets | 744,851 | 686,134
Accrued liabilities: |  |
Collections in excess of revenues and deferred revenues | 127,286 | 121,439
Accrued employee compensation | 55,418 | 46,106
Accrued vacation | 39,971 | 39,022
Warranty reserve, current portion | 5,311 | 5,357
Other | 64,274 | 51,752
Accrued liabilities | 292,260 | 263,676
Other liabilities: |  |
Deferred revenues, long-term portion | 81,877 | 77,831
Deferred rent, long-term portion | 16,525 | 13,769
Warranty reserve, long-term portion | 1,696 | 1,557
Satellite performance incentive obligations, long-term portion | 25,292 | 18,181
Other | 6,580 | 9,902
Other liabilities | 131,970 | 121,240
Technology [Member] |  |
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 90,046 | 90,652
Contracts and Customer Relationships [Member] |  |
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 103,321 | 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 | 10,013 | 10,137
Satellites, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 1,620,760 | 1,613,935
Less: accumulated depreciation and amortization | (432,160) | (373,948)
Property and equipment, net | 1,188,600 | 1,239,987
Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 1,671,962 | 1,442,398
Less: accumulated depreciation and amortization | (806,619) | (719,910)
Property and equipment, net | 865,343 | 722,488
Satellites [Member] | Satellites, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 978,114 | 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 | 543,556 | 362,342
Construction in Progress [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 167,897 | 108,192
Equipment and Software [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 970,351 | 864,140
CPE Leased Equipment [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 354,430 | 298,746
Less: accumulated depreciation and amortization | (137,600) | (129,000)
Furniture and Fixtures [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 46,049 | 35,234
Leasehold Improvements [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 122,021 | 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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