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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2020
Net income for purposes of calculating basic and diluted earnings per share $ 86,282 $ 52,100 $ 36,997
Weighted average shares outstanding (in shares) 84,591 84,360 81,659
Dilutive effect of employee stock options (in shares) 482 358 318
Weighted average common and common equivalent shares outstanding (in shares) 86,200 85,756 82,867
EARNINGS PER SHARE (Note 16)      
Basic (in dollars per share) $ 1.02 $ 0.62 $ 0.45
Diluted (in dollars per share) $ 1.00 $ 0.61 $ 0.45
Restricted Stock Units (RSUs) [Member]      
Dilutive effect of employee stock options (in shares) 1,127 1,038 890