Stock-Based Compensation - Summary of the Activity for Performance Unit Awards (Details) (Performance shares [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Apr. 26, 2015	Jan. 25, 2015
Units
Beginning balance (in shares)	426
Performance units granted (in shares)	235
Performance units vested (in shares)	0
Performance units cancelled/forfeited (in shares)	(61)
Ending balance (in shares)	600	426
Weighted Average Grant Date Fair Value (per share)
Beginning balance (in dollars per share)	$ 27.17
Performance units granted (in dollars per share)	$ 28.60
Performance units vested (in dollars per share)	$ 0.00
Performance units forfeited (in dollars per share)	$ 27.83
Ending balance (in dollars per share)	$ 27.67	$ 27.17
Aggregate Unrecognized Compensation
Beginning balance	$ 6,164
Ending balance	10,161	6,164
Weighted Average Period Over Which Expected to be Recognized (in years)
Weighted average period over which expected to be recognized	2 years 0 months	1 year 7 months
Subject To Share Settlement [Member]
Units
Beginning balance (in shares)	211
Performance units granted (in shares)	145
Performance units vested (in shares)	0
Performance units cancelled/forfeited (in shares)	(30)
Ending balance (in shares)	326
Subject To Cash Settlement [Member]
Units
Beginning balance (in shares)	215
Performance units granted (in shares)	90
Performance units vested (in shares)	0
Performance units cancelled/forfeited (in shares)	(31)
Ending balance (in shares)	274
Recorded Liability
Beginning balance	1,891
Change in liability	(18)
Ending balance	$ 1,873