Derivative Instruments - Derivatives by Income Statement Location And Comprehensive Income (Details) (Cash flow hedging, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 28, 2012	Dec. 30, 2011
Designated as hedging instrument
Derivative instruments
(Gain) loss recognized in comprehensive income	$ 6,477	$ 18,732
(Gain) loss reclassified from AOCI	7,539	31,021
Designated as hedging instrument | Interest rate swap agreements
Derivative instruments
(Gain) loss recognized in comprehensive income	3,132	16,076
Designated as hedging instrument | Interest rate swap agreements | Interest expense
Derivative instruments
(Gain) loss reclassified from AOCI	5,542	28,838
Designated as hedging instrument | Cross currency swap agreements
Derivative instruments
(Gain) loss recognized in comprehensive income	3,345	2,726
Designated as hedging instrument | Cross currency swap agreements | Interest expense
Derivative instruments
(Gain) loss reclassified from AOCI	1,997	2,113
Designated as hedging instrument | Natural gas hedge agreements
Derivative instruments
(Gain) loss recognized in comprehensive income	0	(70)
Designated as hedging instrument | Natural gas hedge agreements | Cost of services provided
Derivative instruments
(Gain) loss reclassified from AOCI	0	70
Not designated as hedging instrument
Derivative instruments
(Gain) loss reclassified recognized in income	3,496	(1,319)
Not designated as hedging instrument | Cross currency swap agreements | Interest expense
Derivative instruments
(Gain) loss reclassified recognized in income	2,534	0
Not designated as hedging instrument | Gasoline and diesel fuel agreements | Cost of services provided
Derivative instruments
(Gain) loss reclassified recognized in income	122	(537)
Not designated as hedging instrument | Foreign exchange forward | Interest expense
Derivative instruments
(Gain) loss reclassified recognized in income	$ 840	$ (782)