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Earnings Per Share - Additional Information (Detail) (Stock Options [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
Jun. 29, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Common stock outstanding, included in computation of diluted earnings per share 11.2 11.6 11.2 11.6
Common stock outstanding, not included in computation of diluted earnings per share 9.5 10.7 10.3 7.5
Minimum [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Outstanding options to purchase common stock     $ 6.43 $ 4.60
Maximum [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Outstanding options to purchase common stock     $ 16.23 $ 16.23