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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, 2018 | Mar. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Other acquired intangible assets, gross | $ 219,137 | $ 215,091
Other acquired intangible assets, accumulated amortization | (187,275) | (173,414)
Other acquired intangible assets, net | $ 31,862 | 41,677
Technology [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Life | 6 years |
Other acquired intangible assets, gross | $ 90,652 | 87,592
Other acquired intangible assets, accumulated amortization | (69,387) | (62,749)
Other acquired intangible assets, net | $ 21,265 | 24,843
Contracts and Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Useful Life | 7 years |
Other acquired intangible assets, gross | $ 103,808 | 103,034
Other acquired intangible assets, accumulated amortization | (94,584) | (89,083)
Other acquired intangible assets, net | $ 9,224 | 13,951
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 | (7,668) | (6,743)
Other acquired intangible assets, net | $ 932 | 1,857
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 | $ 10,137 | 9,925
Other acquired intangible assets, accumulated amortization | (9,696) | (8,899)
Other acquired intangible assets, net | $ 441 | $ 1,026

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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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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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