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Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 31, 2018
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable, Billed | $ 156,860 | $ 184,536
Accounts receivable, Unbilled | 80,852 | 85,156
Allowance for doubtful accounts | (1,627) | (2,027)
Accounts receivable, net | 236,085 | 267,665
Inventories: |  |
Raw materials | 71,901 | 62,252
Work in process | 47,756 | 47,465
Finished goods | 100,361 | 86,590
Inventories | 220,018 | 196,307
Prepaid expenses and other current assets: |  |
Prepaid expenses | 87,019 | 68,516
Other | 15,958 | 8,619
Prepaid expenses and other current assets | 102,977 | 77,135
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 217,233 | 219,137
Less: accumulated amortization | (188,675) | (187,275)
Other acquired intangible assets, net | 28,558 | 31,862
Other assets: |  |
Investment in unconsolidated affiliate | 169,454 | 163,835
Deferred income taxes | 242,894 | 222,274
Capitalized software costs, net | 246,788 | 246,792
Patents, orbital slots and other licenses, net | 17,000 | 16,100
Other | 66,022 | 37,133
Other assets | 742,158 | 686,134
Accrued liabilities: |  |
Collections in excess of revenues and deferred revenues | 115,579 | 121,439
Accrued employee compensation | 27,133 | 46,106
Accrued vacation | 40,710 | 39,022
Warranty reserve, current portion | 4,935 | 5,357
Other | 63,955 | 51,752
Accrued liabilities | 252,312 | 263,676
Other liabilities: |  |
Deferred revenues, long-term portion | 81,573 | 77,831
Deferred rent, long-term portion | 14,391 | 13,769
Warranty reserve, long-term portion | 1,540 | 1,557
Satellite performance incentive obligations, long-term portion | 25,670 | 18,181
Other | 9,086 | 9,902
Other liabilities | 132,260 | 121,240
Technology [Member] |  |
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 89,204 | 90,652
Contracts and Customer Relationships [Member] |  |
Other acquired intangible assets, net: |  |
Other acquired intangible assets, gross | 103,449 | 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 | 10,040 | 10,137
Satellites, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 1,661,446 | 1,613,935
Less: accumulated depreciation and amortization | (396,425) | (373,948)
Property and equipment, net | 1,265,021 | 1,239,987
Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 1,521,337 | 1,442,398
Less: accumulated depreciation and amortization | (749,130) | (719,910)
Property and equipment, net | 772,207 | 722,488
Satellites [Member] | Satellites, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 1,160,593 | 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 | 401,763 | 362,342
Construction in Progress [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 135,560 | 108,192
Equipment and Software [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 899,685 | 864,140
CPE Leased Equipment [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 310,506 | 298,746
Less: accumulated depreciation and amortization | (130,100) | (129,000)
Furniture and Fixtures [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 37,580 | 35,234
Leasehold Improvements [Member] | Property and Equipment, Net [Member] |  |
Property and equipment, net: |  |
Property and equipment | 113,761 | 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 | $ 15,322 | $ 15,322

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