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Leases - Information Related to Our Right-of-Use Assets and Lease Liabilities (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 01, 2019 | Jul. 31, 2019 | Jul. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cash paid for operating lease liabilities |  | $ 19,324 | $ 35,508
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities |  | $ 31,071 | $ 327,021
Operating leases, Weighted average remaining lease term (in years) |  | 6 years | 6 years
Operating leases, Weighted average discount rate, Percent |  | 3.53% | 3.53%
Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities | $ 279,000 |  |
Accounting Standards Update 2016-02, Commenced Subsequent To Adoption |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities |  |  | $ 48,000

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