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Summary of Significant Accounting Policies Schedule of Impact of New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Jan. 31, 2020
Jan. 31, 2019
Current assets:    
Prepaid expenses and other current assets $ 32,950 $ 28,237 [1]
Total current assets 1,599,725 708,116 [1]
Operating lease right-of-use assets 125,204 121,389 [1]
Other noncurrent assets 18,505 15,089 [1]
Total assets 1,955,395 984,313 [1]
Liabilities and stockholders’ equity    
Accrued expenses and other liabilities 36,887 33,653 [1]
Total current liabilities 546,963 573,104 [1]
Operating lease liabilities, noncurrent 154,511 147,046 [1]
Other noncurrent liabilities 5,361 3,018 [1]
Total liabilities 1,550,051 731,936 [1]
Total liabilities and stockholders’ equity $ 1,955,395 984,313 [1]
As Reported    
Current assets:    
Prepaid expenses and other current assets   29,451
Total current assets   709,330
Operating lease right-of-use assets   0
Other noncurrent assets   15,286
Total assets   864,335
Liabilities and stockholders’ equity    
Accrued expenses and other liabilities   24,740
Total current liabilities   564,191
Operating lease liabilities, noncurrent   0
Other noncurrent liabilities   38,999
Total liabilities   611,958
Total liabilities and stockholders’ equity   864,335
Adoption of ASC 842    
Current assets:    
Prepaid expenses and other current assets   (1,214)
Total current assets   (1,214)
Operating lease right-of-use assets   121,389
Other noncurrent assets   (197)
Total assets   119,978
Liabilities and stockholders’ equity    
Accrued expenses and other liabilities   8,913
Total current liabilities   8,913
Operating lease liabilities, noncurrent   147,046
Other noncurrent liabilities   (35,981)
Total liabilities   119,978
Total liabilities and stockholders’ equity   $ 119,978
[1] Adjusted for adoption of ASC 842. See Note 2.