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Leases - Information Related to Our Right-of-Use Assets and Lease Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Jan. 31, 2021
Leases [Abstract]          
Cash paid for operating lease liabilities $ 21,802 $ 22,765 $ 68,375 $ 64,930  
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities $ 15,646 $ 113,219 $ 54,335 $ 183,722  
Weighted average remaining lease term (in years) 5 years   5 years   6 years
Weighted average discount rate 2.32%   2.32%   1.73%