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Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Mar. 31, 2017
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable, Billed | $ 157,903 | $ 145,626
Accounts receivable, Unbilled | 96,528 | 119,565
Allowance for doubtful accounts | (2,552) | (1,470)
Accounts receivable, net | 251,879 | 263,721
Inventories: |  |
Raw materials | 59,008 | 56,096
Work in process | 42,216 | 25,820
Finished goods | 80,175 | 81,285
Inventories | 181,399 | 163,201
Prepaid expenses and other current assets: |  |
Prepaid expenses | 61,841 | 51,856
Other | 10,548 | 5,980
Prepaid expenses and other current assets | 72,389 | 57,836
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 217,725 | 215,091
Less: accumulated amortization | (180,929) | (173,414)
Other acquired intangible assets, net | 36,796 | 41,677
Other assets: |  |
Investment in unconsolidated affiliate | 153,973 | 141,894
Deferred income taxes | 209,477 | 134,764
Capitalized software costs, net | 225,163 | 203,686
Patents, orbital slots and other licenses, net | 16,300 | 16,500
Other | 37,177 | 32,522
Other assets | 642,090 | 529,366
Accrued liabilities: |  |
Collections in excess of revenues and deferred revenues | 86,293 | 76,682
Accrued employee compensation | 25,774 | 41,691
Accrued vacation | 34,311 | 33,214
Warranty reserve, current portion | 6,514 | 7,796
Other | 54,108 | 65,576
Accrued liabilities | 207,000 | 224,959
Other liabilities: |  |
Deferred revenue, long-term portion | 71,666 | 4,617
Deferred rent, long-term portion | 12,219 | 10,743
Warranty reserve, long-term portion | 2,145 | 3,262
Satellite performance incentives obligation, long-term portion | 18,700 | 19,164
Deferred income taxes, long-term | 566 | 1,936
Other | 7,683 | 3,000
Other liabilities | 112,979 | 42,722
Technology [Member] |  |
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 89,580 | 87,592
Contracts and Customer Relationships [Member] |  |
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 103,540 | 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 | 10,065 | 9,925
Satellites, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 1,508,537 | 1,434,824
Less accumulated depreciation and amortization | (345,686) | (326,554)
Property and equipment, net | 1,162,851 | 1,108,270
Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 1,287,903 | 1,202,589
Less accumulated depreciation and amortization | (710,386) | (661,981)
Property and equipment, net | 577,517 | 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 | 858,246 | 776,354
Construction in Progress [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 140,667 | 116,902
Equipment and Software [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 741,635 | 679,008
CPE Leased Equipment [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 260,219 | 271,917
Less accumulated depreciation and amortization | (162,400) | (158,200)
Furniture and Fixtures [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 32,430 | 30,539
Leasehold Improvements [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 89,456 | 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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