Stock-Based Compensation - Summary of Activity For Stock Settled Non-Employee Directors Stock Unit Awards (Details) - Subject To Share Settlement - Non-employee director stock unit awards - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Jan. 31, 2016	Jan. 25, 2015
Number of Units
Beginning balance (in shares)		0
Stock units granted (in shares)		24
Stock units vested (in shares)		0
Stock units forfeited (in shares)		0
Ending balance (in shares)		24	0
Weighted Average Grant Date Fair Value (per unit)
Beginning balance (in dollars per share)		$ 0.00
Stock units granted (in dollars per share)		19.70
Stock units vested (in dollars per share)		0.00
Ending balance (in dollars per share)		$ 19.70	$ 0.00
Aggregate Intrinsic Value
Stock units vested	[1]	$ 0
Aggregate Unrecognized Compensation
Beginning balance		0
Ending balance		$ 186	$ 0
Period Over Which Expected to be Recognized (in years)
Ending Balance		4 months 24 days	0 years

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