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Acquisitions - (Additional Information) (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Dec. 07, 2018 | Dec. 31, 2019 | Dec. 30, 2018 | Dec. 31, 2019 | Dec. 30, 2018 | Mar. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  | $ 679,051 |  | $ 679,051 |  | $ 656,399
Closing day spot rate (USD per share) |  | $ 79.20 |  |  |  |  |
Unrecognized tax benefits |  |  | 6,607 |  | 6,607 |  | $ 7,840
Amortization of intangible assets |  |  | 9,843 | $ 3,105 | 24,468 | $ 7,220 |
Amortization of intangible assets, remainder of 2020 |  |  | 10,055 |  | 10,055 |  |
Amortization of intangible assets, 2021 |  |  | 39,336 |  | 39,336 |  |
Amortization of intangible assets, 2022 |  |  | 39,092 |  | 39,092 |  |
Amortization of intangible assets, 2023 |  |  | 35,434 |  | 35,434 |  |
Amortization of intangible assets, 2024 |  |  | 29,668 |  | 29,668 |  |
Alpha |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Initial purchase consideration |  | $ 750,000 |  |  |  |  |
Consideration transferred |  | 742,502 |  |  |  |  |
Goodwill |  | 319,228 |  |  |  |  |
Estimated tax-deductible goodwill |  |  | $ 41,852 |  | 41,852 |  |
Payments to acquire businesses |  | 650,000 |  |  |  |  |
Shares issued in acquisition, value |  | 93,268 |  |  |  |  |
Working capital adjustment |  | $ 766 |  |  |  |  |
Shares issued in acquisition (USD per share) |  | $ 84.92 |  |  |  |  |
Debt assumed |  | $ 145,304 |  |  |  |  |
Alpha | Customer relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired intangible assets |  |  |  |  | 221,000 |  |
N Holding AB [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 23,242 |  |  |  |  |  |
Payments to acquire businesses | 77,777 |  |  |  |  |  |
Debt assumed | 107,018 |  |  |  |  |  |
N Holding AB [Member] | Developed Technology Rights |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired intangible assets | $ 13,689 |  |  |  |  |  |
Useful life of intangible assets | 10 years |  |  |  |  |  |
N Holding AB [Member] | Trademarks |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired intangible assets | $ 13,937 |  |  |  |  |  |
Useful life of intangible assets | 3 years |  |  |  |  |  |
N Holding AB [Member] | Customer relationships |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired intangible assets | $ 55,003 |  |  |  |  |  |
Useful life of intangible assets | 14 years |  |  |  |  |  |
Trademarks | Alpha |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired indefinite-lived intangible assets |  |  |  |  | $ 56,000 |  |
Common Stock | Alpha |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Shares issued in acquisition (in shares) |  | 1,177,630 |  |  |  |  |

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