Share-Based Compensation - Summary of the Activity for Stock Option Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Jan. 28, 2018	Jan. 26, 2018	Jul. 30, 2017
Number of Shares
Beginning balance (in shares)		1,511
Options granted (in shares)		135
Options exercised (in shares)		(275)
Options cancelled/forfeited (in shares)		(26)
Ending balance (in shares)		1,345
Exercisable at end of the period (in shares)		807
Options vested and expected to vest after period end (in shares)		1,345
Weighted Average Exercise Price (per share)
Beginning balance (in dollars per share)		$ 24.79
Options granted (in dollars per share)		37.70
Options exercised (in dollars per share)		24.27
Options cancelled/forfeited (in dollars per share)		26.22
Ending balance (in dollars per share)		26.17
Exercisable at end of the period (in dollars per share)		26.61
Options vested and expected to vest after period end (in dollars per share)		$ 26.17
Aggregate Intrinsic Value
Beginning balance	[1]	$ 13,503
Options exercised	[1]	3,446
Ending balance	[1]	13,953
Exercisable at end of the period	[1]	7,941
Vested and expected to vest after period end	[1]	$ 13,953
Number of Shares Exercisable
Beginning balance		759
Ending balance		807
Weighted Average Contractual Term
Exercisable at end of the period		2 years 1 month
Vested and expected to vest after period end		3 years
Closing price of common stock			$ 36.45	$ 39.75

[1] The aggregate intrinsic value of stock options vested and exercisable and vested and expected to vest as of January 28, 2018 is calculated based on the difference between the exercise price and the closing price $36.45 of the Company's common stock on January 26, 2018.