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Goodwill and Other Intangibe Assets - Schedule of Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Mar. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount (Note 2) | $ 157,485 | $ 104,965
Accumulated Amortization | (63,639) | (57,401)
Net Carrying Amount | 93,846 | 47,564
Trademark and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount (Note 2) | 23,380 | 16,500
Accumulated Amortization | (8,012) | (6,933)
Net Carrying Amount | 15,368 | 9,567
Developed Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount (Note 2) | 75,825 | 63,285
Accumulated Amortization | (46,225) | (42,831)
Net Carrying Amount | 29,600 | 20,454
Customer contracts/relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount (Note 2) | 58,280 | 25,180
Accumulated Amortization | (9,402) | (7,637)
Net Carrying Amount | $ 48,878 | $ 17,543

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- Definition Accumulated amount of 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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