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STOCK-BASED COMPENSATION - Unvested Awards Roll Forward (Details)
shares in Thousands
6 Months Ended
Jul. 31, 2021
$ / shares
shares
Deferred Awards  
Number of Shares  
Unvested awards, beginning of period (in shares) | shares 550
Granted (in shares) | shares 143
Vested (in shares) | shares (217)
Forfeited (in shares) | shares (3)
Unvested awards, end of period (in shares) | shares 473
Weighted Average Grant Date Fair Value  
Unvested awards, beginning of period (in usd per share) | $ / shares $ 55.43
Granted (in usd per share) | $ / shares 75.76
Vested (in usd per share) | $ / shares 86.18
Forfeited (in usd per share) | $ / shares 97.00
Unvested awards, end of period (in usd per share) | $ / shares $ 47.12
Performance Awards  
Number of Shares  
Unvested awards, beginning of period (in shares) | shares 350
Granted (in shares) | shares 144
Shares earned in excess of (below) target (in shares) | shares (22)
Vested (in shares) | shares (118)
Forfeited (in shares) | shares (1)
Unvested awards, end of period (in shares) | shares 353
Weighted Average Grant Date Fair Value  
Unvested awards, beginning of period (in usd per share) | $ / shares $ 74.37
Granted (in usd per share) | $ / shares 73.73
Shares earned in excess of (below) target (in usd per share) | $ / shares 65.34
Vested (in usd per share) | $ / shares 95.61
Forfeited (in usd per share) | $ / shares 108.21
Unvested awards, end of period (in usd per share) | $ / shares $ 67.50