Stock-Based Compensation (Unvested Restricted Stock Activity) (Details) - Restricted stock shares in Thousands	3 Months Ended
	May 05, 2018 $ / shares shares
Number of shares
Beginning Balance (in shares) | shares	5,483
Awarded (in shares) | shares	1,070
Released (in shares) | shares	(1,460)
Forfeited (in shares) | shares	(41)
Ending Balance (in shares) | shares	5,052
Weighted average grant date fair value
Beginning Balance (in dollars per share) | $ / shares	$ 51.19
Awarded (in dollars per share) | $ / shares	74.72
Released (in dollars per share) | $ / shares	44.70
Forfeited (in dollars per share) | $ / shares	57.55
Ending Balance (in dollars per share) | $ / shares	$ 59.13