Debt (Details) (USD $)	3 Months Ended				12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Debt Instrument Line Items
Long Term Debt	$ 1,995,632,000				$ 1,995,632,000	$ 1,396,606,000
Loss on early retirement of debt	0	(32,954,000)	0	0	(32,954,000)	0	0
longtermdebtmaturitiesrepaymentsofprincipalinyearthree	600,000,000				600,000,000
Long Term Debt Maturities Repayments Of Principal After Year Five	1,400,000,000				1,400,000,000
Interest Paid					62,900,000	68,500,000	84,500,000
Debt Related Commitment Fees And Debt Issuance Costs					3,900,000	4,200,000	5,200,000
Multi Currency Revolving Credit Facility [Member]
Debt Instrument Line Items
Long Term Debt	0				0	0
Debt Instrument Interest Rate Effective Percentage Rate Range					69 basis points to 110 basis points over LIBOR/EURIBOR/Bankers Acceptance Stamping Fee; on borrowings denominated in Canadian dollars, the greater of the Canadian prime rate or the CDOR rate
Line of Credit Facility Commitment Fee Percentage					0.10%
Line of Credit Facility Maximum Borrowing Capacity	1,400,000,000				1,400,000,000
Debt Instrument Facility Fee Rate Effective Percentage Rate Range Minimum					0.06%
Debt Instrument Facility Fee Rate Effective Percentage Rate Range Maximum					0.15%
Multi Currency Revolving Credit Facility [Member] | LIBOR / EURIBOR / Bankers Acceptance Stamping Fee [Member]
Debt Instrument Line Items
Debt Instrument Interest Rate Stated Percentage	0.90%				0.90%
Debt Instrument Interest Rate Effective Percentage Rate Range Minimum					0.69%
Debt Instrument Interest Rate Effective Percentage Rate Range Maximum					1.10%
Receivables Securitization Facility [Member]
Debt Instrument Line Items
Long Term Debt	0				0	0
Debt Instrument Ability to Increase Commitment Subject to Lender Approval	250,000,000				250,000,000
Line of Credit Facility Maximum Borrowing Capacity	950,000,000				950,000,000
Line of Credit Facility Unused Capacity Commitment Fee Percentage					0.40%
Receivables Securitization Facility [Member] | London Interbank Offered Rate LIBOR [Member]
Debt Instrument Line Items
Debt Instrument Interest Rate Stated Percentage	0.75%				0.75%
Revolving Credit Note [Member]
Debt Instrument Line Items
Long Term Debt	0				0	0
Line of Credit Facility Maximum Borrowing Capacity	75,000,000				75,000,000
Senior Notes Due 2015 [Member]
Debt Instrument Line Items
Long Term Debt	0				0	499,377,000
Debt Instrument Face Amount						500,000,000
Loss on early retirement of debt					(31,500,000)
Debt Instrument Interest Rate Stated Percentage						5.875%
Senior Notes Due 2017 [Member]
Debt Instrument Line Items
Long Term Debt	599,379,000				599,379,000	0
Debt Instrument Face Amount	600,000,000				600,000,000
Debt Instrument Issuance Discount Percentage	99.892%				99.892%
Debt Instrument Interest Rate Effective Percentage	1.187%				1.187%
Debt Instrument Interest Rate Stated Percentage	1.15%				1.15%
Senior Notes Due 2019 [Member]
Debt Instrument Line Items
Long Term Debt	398,122,000				398,122,000	397,803,000
Debt Instrument Face Amount	400,000,000				400,000,000
Debt Instrument Issuance Discount Percentage	99.20%				99.20%
Debt Instrument Interest Rate Effective Percentage	4.98%				4.98%
Debt Instrument Interest Rate Stated Percentage	4.875%				4.875%
Senior Notes Due 2021 [Member]
Debt Instrument Line Items
Long Term Debt	499,497,000				499,497,000	499,426,000
Debt Instrument Face Amount	500,000,000				500,000,000
Debt Instrument Issuance Discount Percentage	99.858%				99.858%
Debt Instrument Interest Rate Effective Percentage	3.52%				3.52%
Debt Instrument Interest Rate Stated Percentage	3.50%				3.50%
Senior Notes Due 2024 [Member]
Debt Instrument Line Items
Long Term Debt	498,634,000				498,634,000	0
Debt Instrument Face Amount	$ 500,000,000				$ 500,000,000
Debt Instrument Issuance Discount Percentage	99.715%				99.715%
Debt Instrument Interest Rate Effective Percentage	3.434%				3.434%
Debt Instrument Interest Rate Stated Percentage	3.40%				3.40%