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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, 2017 | Mar. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Other acquired intangible assets, gross | $ 215,091 | $ 197,604
Other acquired intangible assets, accumulated amortization | (173,414) | (164,000)
Other acquired intangible assets, net | $ 41,677 | 33,604
Technology [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Life | 6 years |
Other acquired intangible assets, gross | $ 87,592 | 74,848
Other acquired intangible assets, accumulated amortization | (62,749) | (59,921)
Other acquired intangible assets, net | $ 24,843 | 14,927
Contracts and Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Life | 7 years |
Other acquired intangible assets, gross | $ 103,034 | 99,499
Other acquired intangible assets, accumulated amortization | (89,083) | (83,928)
Other acquired intangible assets, net | $ 13,951 | 15,571
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 | (6,743) | (5,818)
Other acquired intangible assets, net | $ 1,857 | 2,782
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) | (5,918)
Other acquired intangible assets, net |  | 22
Other [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Life | 6 years |
Other acquired intangible assets, gross | $ 9,925 | 8,717
Other acquired intangible assets, accumulated amortization | (8,899) | (8,415)
Other acquired intangible assets, net | $ 1,026 | $ 302

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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://www.xbrl.org/2003/role/presentationRef -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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