Summary of Long-term Debt Outstanding (Detail) (USD $)	Sep. 26, 2014	Sep. 27, 2013
Debt Instrument [Line Items]
Long-term Debt	$ 437,500,000	$ 506,300,000
Less: current maturities of long-term debt	(50,000,000)	(56,250,000)
Long-term debt	387,500,000	450,000,000
Unsecured Term Loan
Debt Instrument [Line Items]
Unsecured term loan		6,300,000
Secured Debt
Debt Instrument [Line Items]
Secured loans	$ 437,500,000	$ 500,000,000