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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