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. 29, 2017	Jan. 27, 2017	Jul. 31, 2016
Number of Shares
Beginning balance (in shares)		1,507
Options granted (in shares)		365
Options exercised (in shares)		(258)
Options cancelled/forfeited (in shares)		(103)
Ending balance (in shares)		1,511
Exercisable at end of the period (in shares)		759
Options vested and expected to vest after period end (in shares)		1,431
Weighted Average Exercise Price (per share)
Beginning balance (in dollars per share)		$ 25.18
Options granted (in dollars per share)		20.71
Options exercised (in dollars per share)		22.30
Options forfeited (in dollars per share)		22.30
Ending balance (in dollars per share)		24.79
Exercisable at end of the period (in dollars per share)		26.90
Options vested and expected to vest after period end (in dollars per share)		$ 24.95
Aggregate Intrinsic Value
Beginning balance	[1]	$ 962
Options exercised	[1]	1,723
Ending balance	[1]	13,503
Exercisable at end of the period	[1]	5,210
Vested and expected to vest after period end	[1]	$ 12,598
Number of Shares Exercisable
Beginning balance		775
Ending balance		759
Weighted Average Contractual Term
Exercisable at end of the period		2 years 5 months
Vested and expected to vest after period end		3 years 5 months
Closing price of common stock			$ 33.70	$ 25.42

[1] The aggregate intrinsic value of stock options vested and exercisable and vested and expected to vest as of January 29, 2017 is calculated based on the difference between the exercise price and the closing price $33.70 of the Company's common stock on January 27, 2017.