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Acquisitions - (Other Intangible Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Mar. 31, 2019
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Total intangible assets, gross amount | $ 607,908 | $ 523,432
Total intangible assets, accumulated amortization | (85,552) | (61,116)
Total intangible assets, net amount | 522,356 | 462,316
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross amount | 343,110 | 286,664
Finite-lived intangible assets, accumulated amortization | (60,181) | (42,704)
Finite-lived intangible assets, net amount | 282,929 | 243,960
Non-compete |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross amount | 3,142 | 3,025
Finite-lived intangible assets, accumulated amortization | (2,811) | (2,807)
Finite-lived intangible assets, net amount | 331 | 218
Technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross amount | 91,844 | 77,779
Finite-lived intangible assets, accumulated amortization | (17,940) | (12,229)
Finite-lived intangible assets, net amount | 73,904 | 65,550
Trademarks |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets, gross amount | 152,465 | 152,484
Indefinite-lived intangible assets, accumulated amortization | (953) | (953)
Indefinite-lived intangible assets, net amount | 151,512 | 151,531
Finite-lived intangible assets, gross amount | 16,151 | 2,003
Finite-lived intangible assets, accumulated amortization | (2,471) | (1,236)
Finite-lived intangible assets, net amount | 13,680 | 767
Licenses |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross amount | 1,196 | 1,477
Finite-lived intangible assets, accumulated amortization | (1,196) | (1,187)
Finite-lived intangible assets, net amount | $ 0 | $ 290

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