Derivative Instruments - Derivatives by Balance Sheet Location (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2012	Sep. 30, 2011
Derivative instruments
Fair value of derivative assets	$ 947	$ 2,856
Fair value of derivative liabilities	91,890	131,035
Foreign exchange forward | Prepayments | Not designated as hedging instrument
Derivative instruments
Fair value of derivative assets	251	2,856
Gasoline and diesel fuel agreements | Prepayments | Not designated as hedging instrument
Derivative instruments
Fair value of derivative assets	696	0
Gasoline and diesel fuel agreements | Accounts payable | Designated as hedging instrument
Derivative instruments
Fair value of derivative liabilities	0	1,894
Natural gas hedge agreements | Accounts payable | Designated as hedging instrument
Derivative instruments
Fair value of derivative liabilities	0	187
Interest rate swap agreements | Accrued expenses | Designated as hedging instrument
Derivative instruments
Fair value of derivative liabilities	0	49,349
Interest rate swap agreements | Other noncurrent liabilities | Designated as hedging instrument
Derivative instruments
Fair value of derivative liabilities	46,484	44,054
Cross currency swap agreements | Other noncurrent liabilities | Designated as hedging instrument
Derivative instruments
Fair value of derivative liabilities	$ 45,406	$ 35,551