Management Incentive Plan and Stock-Based Compensation (Unvested Restricted Stock, RSU, and Performance Shares Activity) (Details) - Restricted Stock, Restricted Stock Units, and Performance Shares shares in Thousands	3 Months Ended
	Apr. 30, 2022 $ / shares shares
Number of shares
Beginning balance (in shares) | shares	4,378
Awarded (in shares) | shares	1,335
Released (in shares) | shares	(1,072)
Forfeited (in shares) | shares	(25)
Ending balance (in shares) | shares	4,616
Weighted-average grant date fair value
Beginning balance (in dollars per share) | $ / shares	$ 99.58
Awarded (in dollars per share) | $ / shares	89.00
Released (in dollars per share) | $ / shares	89.63
Forfeited (in dollars per share) | $ / shares	102.89
Ending balance (in dollars per share) | $ / shares	$ 98.82