Stock-Based Compensation - Summary of the Activity For Non-Employee Directors Stock Unit Awards (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Oct. 26, 2014	Jan. 26, 2014
Recorded Liability
Change in liability	$ 16
Non-employee director stock unit awards [Member]
Number of Units
Beginning balance (in shares)	18
Stock units granted (in shares)	24
Stock units vested (in shares)	(18)
Stock units forfeited (in shares)	0
Ending balance (in shares)	24	18
Recorded Liability
Beginning balance	3,981
Change in liability	480
Ending balance	4,461	3,981
Weighted Averaged Grant Date Fair Value (per unit)
Beginning balance (in dollars per share)	$ 35.17
Stock units granted (in dollars per share)	$ 26.59
Stock units vested (in dollars per share)	$ 35.17
Stock units forfeited (in dollars per share)	$ 0.00
Ending balance (in dollars per share)	$ 26.59	$ 35.17
Aggregate Unrecognized Compensation
Beginning balance	177
Ending balance	$ 383	$ 177
Period Over Which Expected to be Recognized (in years)
Weighted average period over which expected to be recognized	8 months	5 months