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Income per Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Earnings Per Share [Abstract]        
Anti-dilutive shares excluded from diluted weighted average shares outstanding 0.3 0.2 0.3 0.1