Equity Incentive Plans, Stock Option Activity (Details) - Stock Options [Member]	3 Months Ended
	May 05, 2018 $ / shares shares
Number of Options [Roll Forward]
Outstanding at beginning of period (in shares) | shares	4,458,387
Granted (in shares) | shares	273,419
Forfeited (in shares) | shares	(9,220)
Exercised (in shares) | shares	(311,776)
Outstanding at end of period (in shares) | shares	4,410,810
Exercisable at end of period (in shares) | shares	2,797,229
Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 11.65
Granted (in dollars per share) | $ / shares	58.79
Forfeited (in dollars per share) | $ / shares	31.28
Exercised (in dollars per share) | $ / shares	11.20
Outstanding at end of period (in dollars per share) | $ / shares	14.57
Exercisable at end of period (in dollars per share) | $ / shares	$ 8.86
Weighted Average Remaining Contractual Term [Abstract]
Outstanding at end of period	6 years 1 month 6 days
Exercisable at end of period	5 years 1 month 6 days