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Goodwill and Acquired Intangible Assets - Allocation of Other Acquired Intangible Assets and Related Accumulated Amortization (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Other acquired intangible assets, gross | $ 217,784 | $ 219,137
Other acquired intangible assets, accumulated amortization | (195,483) | (187,275)
Other acquired intangible assets, net | $ 22,301 | 31,862
Technology [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Life | 6 years |
Other acquired intangible assets, gross | $ 89,972 | 90,652
Other acquired intangible assets, accumulated amortization | (73,992) | (69,387)
Other acquired intangible assets, net | $ 15,980 | 21,265
Contracts and Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Life | 7 years |
Other acquired intangible assets, gross | $ 103,283 | 103,808
Other acquired intangible assets, accumulated amortization | (96,970) | (94,584)
Other acquired intangible assets, net | $ 6,313 | 9,224
Satellite Co-Location Rights [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Life | 9 years |
Other acquired intangible assets, gross | $ 8,600 | 8,600
Other acquired intangible assets, accumulated amortization | (8,592) | (7,668)
Other acquired intangible assets, net | $ 8 | 932
Trade Name [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Life | 3 years |
Other acquired intangible assets, gross | $ 5,940 | 5,940
Other acquired intangible assets, accumulated amortization | $ (5,940) | (5,940)
Other [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Life | 6 years |
Other acquired intangible assets, gross | $ 9,989 | 10,137
Other acquired intangible assets, accumulated amortization | $ (9,989) | (9,696)
Other acquired intangible assets, net |  | $ 441

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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