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Schedule of Information on Non - Vested Restricted Stock Units (Detail) - 6 months ended Jun. 27, 2015 - Non-vested Restricted Stock - $ / shares
Total
Number of Shares  
Beginning Balance 23,353
Granted 1,197
Vested (6,490)
Ending Balance 18,060
Weighted Average Grant Date Fair Value  
Beginning Balance $ 54.90
Granted 62.46
Vested 57.79
Ending Balance $ 54.36