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Acquisition-related Intangible Assets, Net - Schedule of Future Amortization Expense (Detail) - USD ($) $ in Thousands | Apr. 30, 2019 | Jan. 31, 2019
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Total | $ 293,897 | $ 313,240
Acquired Intangible Assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Remainder of 2020 | 49,513 |
2021 | 48,142 |
2022 | 43,733 |
2023 | 41,009 |
2024 | 29,833 |
Thereafter | 81,667 |
Total | $ 293,897 |

X
- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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