Derivative Instruments - Derivatives by Income Statement Location and Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Oct. 01, 2010
Derivative instruments
(Gain) loss reclassified recognized in income	$ 74,492	$ 128,982	$ 142,891
Not designated as hedging instrument
Derivative instruments
(Gain) loss reclassified recognized in income	(241)	(1,586)	(5,812)
Not designated as hedging instrument | Gasoline and diesel fuel agreements | Cost of services provided
Derivative instruments
(Gain) loss reclassified recognized in income	24	0	0
Not designated as hedging instrument | Foreign exchange forward | Interest expense
Derivative instruments
(Gain) loss reclassified recognized in income	(265)	(1,586)	(5,812)
Cash flow hedging | Designated as hedging instrument
Derivative instruments
(Gain) loss reclassified from AOCI	74,733	130,568	148,703
Cash flow hedging | Designated as hedging instrument | Interest rate swap agreements | Interest expense
Derivative instruments
(Gain) loss reclassified from AOCI	66,260	123,739	132,787
Cash flow hedging | Designated as hedging instrument | Cross currency swap agreements | Interest expense
Derivative instruments
(Gain) loss reclassified from AOCI	8,077	8,960	11,763
Cash flow hedging | Designated as hedging instrument | Natural gas hedge agreements | Cost of services provided
Derivative instruments
(Gain) loss reclassified from AOCI	396	158	1,961
Cash flow hedging | Designated as hedging instrument | Gasoline and diesel fuel agreements | Cost of services provided
Derivative instruments
(Gain) loss reclassified from AOCI	$ 0	$ (2,289)	$ 2,192