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Goodwill and Intangible Assets - Estimated Future Amortization of Intangible Assets (Detail)
$ in Thousands
Jan. 31, 2020
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
Remainder of fiscal 2020 $ 65,979
2021 66,960
2022 53,030
2023 37,793
2024 27,821
2025 and thereafter 29,362
IPR&D 1,200
Total $ 282,145