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Leases - Information Related to Our Right-of-Use Assets and Lease Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Jan. 31, 2021
Leases [Abstract]          
Cash paid for operating lease liabilities $ 19,951 $ 21,153 $ 46,573 $ 42,165  
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities $ 17,188 $ 32,216 $ 38,689 $ 70,503  
Weighted average remaining lease term (in years) 5 years   5 years   6 years
Weighted average discount rate 2.36%   2.36%   1.73%