Summary of Long-term Debt Outstanding (Parenthetical) (Detail)	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013
Unsecured Term Loan
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.70%
Unsecured term loan, number of installment payments	1
Debt instrument maturity dates	2014
Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.28%	1.31%
Debt instrument maturity dates	2018