Share-Based Compensation - Summary of the Activity for Unvested Stock Option Awards (Details) - $ / shares shares in Thousands	12 Months Ended
	Jan. 27, 2019	Jan. 28, 2018	Jan. 29, 2017
Number of Shares
Options granted (in shares)	147
Weighted Average Exercise Price (per share)
Beginning balance (in dollars per share)	$ 26.17
Options granted (in dollars per share)	47.99
Options forfeited (in dollars per share)	26.15
Ending balance (in dollars per share)	29.03	$ 26.17
Weighted Average Grant Date Fair Value (per share)
Options granted (in dollars per share)	$ 14.53	$ 10.70	$ 5.71
Unvested Stock Options Award
Number of Shares
Beginning balance (in shares)	534
Options granted (in shares)	147
Options vested (in shares)	(261)
Options forfeited (in shares)	(20)
Ending balance (in shares)	400	534
Weighted Average Exercise Price (per share)
Beginning balance (in dollars per share)	$ 25.50
Options granted (in dollars per share)	47.99
Options vested (in dollars per share)	24.28
Options forfeited (in dollars per share)	26.15
Ending balance (in dollars per share)	34.52	$ 25.50
Weighted Average Grant Date Fair Value (per share)
Beginning balance (in dollars per share)	7.10
Options granted (in dollars per share)	14.53
Options vested (in dollars per share)	6.86
Options forfeited (in dollars per share)	7.30
Ending balance (in dollars per share)	$ 10.07	$ 7.10