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Stock Compensation Plans (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Apr. 30, 2020
Jan. 31, 2020
Shares    
Options forfeited and expired (in shares) (41,563)  
Number of Shares    
Restricted stock granted (in shares) 1,373,313  
Shares withheld related to net share settlement of restricted stock (in shares) 372,335  
Restricted stock forfeited and canceled (in shares) (456,310)  
Options    
Shares    
Outstanding at the beginning of the period (in shares) 823,541  
Options exercised (in shares) (174,182)  
Options forfeited and expired (in shares) (41,563)  
Outstanding at the end of the period (in shares) 607,796 823,541
Vested and expected to vest at the end of the period (in shares) 586,862  
Exercisable at the end of the period (in shares) 238,276  
Weighted-Average Exercise Price Per Share    
Balances at the beginning of the period (in dollars per share) $ 10.79  
Options exercised (in dollars per share) 8.14  
Options forfeited and expired (in dollars per share) 12.69  
Balances at the end of the period (in dollars per share) 11.42 $ 10.79
Vested and expected to vest at the end of the period (in dollars per share) 11.42  
Exercisable at the end of the period (in dollars per share) $ 11.72  
Weighted-Average Remaining Contractual Term    
Weighted- Average Remaining Contractual Term 6 years 5 months 12 days 6 years 7 months 9 days
Vested and expected to vest at the end of the period 6 years 4 months 17 days  
Vested and exercisable at the end of the period 3 years 6 months 18 days  
Aggregate Intrinsic Value    
Options exercised (in dollars) $ 20,889  
Outstanding at the end of the period (in dollars) 78,370 $ 118,978
Vested and expected to vest at the end of the period (in dollars) 75,672  
Vested and exercisable at the end of the period (in dollars) 30,652  
Unrecognized compensation cost    
Total unrecognized compensation cost related to stock options $ 35,400  
Weighted-average period over which unrecognized compensation cost is expected to be recognized 2 years 2 months 12 days  
RSUs    
Number of Shares    
Balances at the beginning of the period (in shares) 13,141,650  
Restricted stock granted (in shares) 1,373,313  
Restricted stock vested (in shares) (1,251,916)  
Restricted stock forfeited and canceled (in shares) (456,310)  
Balances at the end of the period (in shares) 12,806,737 13,141,650
Restricted stock vested and expected to vest at the end of the period (in shares) 11,923,564  
Unrecognized compensation cost    
Total unrecognized compensation cost $ 1,160,000  
Weighted-average period over which unrecognized compensation cost is expected to be recognized 2 years 9 months 18 days  
Additional disclosures    
Weighted-average grant date fair value of awards granted (in dollars per share) $ 129.59  
PSUs    
Number of Shares    
Restricted stock granted (in shares) 318,514  
Unrecognized compensation cost    
Total unrecognized compensation cost $ 92,200  
Weighted-average period over which unrecognized compensation cost is expected to be recognized 2 years 8 months 12 days  
Additional disclosures    
Weighted-average grant date fair value of awards granted (in dollars per share) $ 136.75  
RSAs    
Number of Shares    
Balances at the beginning of the period (in shares) 857,793  
Restricted stock vested (in shares) (72,304)  
Balances at the end of the period (in shares) 785,489 857,793
Unrecognized compensation cost    
Total unrecognized compensation cost $ 58,100  
Weighted-average period over which unrecognized compensation cost is expected to be recognized 2 years 1 month 6 days  
Minimum | PSUs    
Number of Shares    
Award vesting rights 0.00%  
Maximum | PSUs    
Number of Shares    
Award vesting rights 200.00%  
Additional award vesting rights 50.00%