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Stock-Based Compensation - Summary of the Activity For Non-Employee Directors Stock Unit Awards (Details) (Non-employee director stock unit awards [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
6 Months Ended 12 Months Ended
Jul. 28, 2013
Jan. 27, 2013
Non-employee director stock unit awards [Member]
   
Number of Units    
Beginning balance (in shares) 20  
Stock units granted (in shares) 18  
Stock units vested (in shares) (20)  
Stock units forfeited (in shares) 0  
Ending balance (in shares) 18 20
Recorded Liability    
Beginning balance $ 4,557  
Change in liability 537  
Ending balance 5,094 4,557
Weighted Averaged Grant Date Fair Value (per unit)    
Beginning balance (in dollars per share) $ 24.46  
Stock units granted (in dollars per share) $ 35.17  
Stock units vested (in dollars per share) $ 24.46  
Stock units forfeited (in dollars per share) $ 0.00  
Ending balance (in dollars per share) $ 35.17 $ 24.46
Aggregate Unrecognized Compensation    
Beginning balance 253  
Ending balance $ 518  
Period Over Which Expected to be Recognized (in years)    
Weighted average period over which expected to be recognized 11 months 5 months