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Deferred and Restricted Stock Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended
Jul. 13, 2013
Deferred Stock Activity
  
Number of Shares  
Number of Shares, Balance at beginning of period 378,000
Number of shares, Issued 89,000
Number of shares, Deferred stock exercised (81,000)
Number of shares, Balance at end of period 445,000
Outstanding vested at end of period 269,000
Outstanding unvested at end of period 176,000
Shares vesting at end of period 110,000
Weighted Average Fair Value  
Weighted Average Fair Value, at beginning of period $ 11.49
Weighted Average Fair Value, Stock issued $ 19.07
Weighted Average Fair Value, Deferred stock exercised $ 12.91
Weighted Average Fair Value, Balance at end of period $ 14.19
Outstanding vested at end of period $ 11.08
Outstanding unvested at end of period $ 18.92
Shares vesting at end of period $ 13.37
Balance at end of period, Weighted Average Remaining Contractual Term (Years) 9 months 7 days
Outstanding unvested at end of period, Weighted Average Remaining Contractual Term (Years) 1 year 11 months 9 days
Aggregate Intrinsic Value, Balance at end of period $ 10,487
Outstanding vested at end of period, Aggregate Intrinsic Value 6,335
Outstanding unvested at end of period, Aggregate Intrinsic Value 4,152
Shares vesting at end of period, Aggregate Intrinsic Value $ 2,587
Restricted Stock
  
Number of Shares  
Number of shares, Issued 59,000
Weighted Average Fair Value  
Weighted Average Fair Value, Stock issued $ 22.25