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Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable, Billed | $ 131,474 | $ 145,626
Accounts receivable, Unbilled | 98,888 | 119,565
Allowance for doubtful accounts | (2,325) | (1,470)
Accounts receivable, net | 228,037 | 263,721
Inventories: |  |
Raw materials | 65,223 | 56,096
Work in process | 41,777 | 25,820
Finished goods | 75,059 | 81,285
Inventories | 182,059 | 163,201
Prepaid expenses and other current assets: |  |
Prepaid expenses | 68,933 | 51,856
Other | 7,423 | 5,980
Prepaid expenses and other current assets | 76,356 | 57,836
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 218,096 | 215,091
Less: accumulated amortization | (184,234) | (173,414)
Other acquired intangible assets, net | 33,862 | 41,677
Other assets: |  |
Investment in unconsolidated affiliate | 160,975 | 141,894
Deferred income taxes | 205,735 | 134,764
Capitalized software costs, net | 238,642 | 203,686
Patents, orbital slots and other licenses, net | 16,200 | 16,500
Other | 37,261 | 32,522
Other assets | 658,813 | 529,366
Accrued liabilities: |  |
Collections in excess of revenues and deferred revenues | 77,371 | 76,682
Accrued employee compensation | 48,608 | 41,691
Accrued vacation | 35,381 | 33,214
Warranty reserve, current portion | 5,514 | 7,796
Other | 58,994 | 65,576
Accrued liabilities | 225,868 | 224,959
Other liabilities: |  |
Deferred revenue, long-term portion | 79,407 | 4,617
Deferred rent, long-term portion | 13,093 | 10,743
Warranty reserve, long-term portion | 1,831 | 3,262
Satellite performance incentives obligation, long-term portion | 18,445 | 19,164
Deferred income taxes, long-term | 300 | 1,936
Other | 4,762 | 3,000
Other liabilities | 117,838 | 42,722
Technology [Member] |  |
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 89,857 | 87,592
Contracts and Customer Relationships [Member] |  |
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 103,613 | 103,034
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 | 10,086 | 9,925
Satellites, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 1,553,130 | 1,434,824
Less accumulated depreciation and amortization | (358,306) | (326,554)
Property and equipment, net | 1,194,824 | 1,108,270
Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 1,392,553 | 1,202,589
Less accumulated depreciation and amortization | (733,400) | (661,981)
Property and equipment, net | 659,153 | 540,608
Satellites [Member] | Satellites, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 551,201 | 559,380
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 | 902,839 | 776,354
Construction in Progress [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 154,615 | 116,902
Equipment and Software [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 773,410 | 679,008
CPE Leased Equipment [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 312,049 | 271,917
Less accumulated depreciation and amortization | (164,400) | (158,200)
Furniture and Fixtures [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 33,812 | 30,539
Leasehold Improvements [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 95,171 | 80,727
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 | $ 14,573 | $ 14,573

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