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Schedule of Information on Restricted Stock Units (Detail) - 6 months ended Jun. 27, 2015 - Restricted Stock Units (RSUs) - $ / shares
Total
Number of Shares  
Beginning Balance 425,630
Granted 111,669
Vested (91,382)
Ending Balance 445,917
Weighted Average Grant Date Fair Value  
Beginning Balance $ 50.72
Granted 53.31
Vested 51.98
Ending Balance $ 51.11