Earnings Per Share - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 24, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock outstanding, included in computation of diluted EPS	12,571,000	11,638,000
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock outstanding, not included in computation of diluted EPS	10,400,000	6,100,000	8,400,000
Stock Options [Member] | Minimum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding options to purchase common stock	$ 4.60	$ 4.60	$ 4.60
Stock Options [Member] | Maximum [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding options to purchase common stock	$ 16.23	$ 16.23	$ 17.99
Stock Options [Member] | Class A Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock outstanding, included in computation of diluted EPS	12,600,000	11,600,000	12,100,000