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Accounting Standards - Recently Adopted Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Jul. 31, 2019
Apr. 30, 2019
Feb. 01, 2019
Jan. 31, 2019
Apr. 30, 2018
Jan. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Operating lease right-of-use assets $ 294,824          
Operating lease liabilities $ 309,417          
Accounting Standards Update 2016-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Operating lease right-of-use assets     $ 279,000      
Operating lease liabilities     307,000      
Deferred rent obligation and lease incentives     28,000      
Accumulated Deficit | Accounting Standards Update 2018-07            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect of new accounting principle in period of adoption   $ 0 $ 400 $ (381) $ 0 $ 0