Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2008
Lease expiration period, years	10
Rent expense under such operating lease agreement	$ 19,000,000	$ 21,000,000	$ 27,000,000
Aggregate self-insured liability	6,000,000
Retention for medical costs per person per annum	200,000
Interest expense	39,000,000	40,000,000	30,000,000
Benefit From Legal Judgment	3,000,000
Maximum [Member] | Environmental Matters [Member]
Charges for environmental expense			1,000,000
Interest expense	1,000,000	1,000,000	1,000,000
Maximum [Member] | Respirator Liabilities [Member]
Interest expense	1,000,000
Environmental Matters [Member]
Reserve for environmental matters	6,000,000	7,000,000
Reserve for environmental matters included in accrued expenses	2,000,000	2,000,000
Reserve for environmental matters included in other liabilities	4,000,000	5,000,000
Charges for environmental expense	1,000,000	3,000,000
Cash payments for environmental reserves	2,000,000	1,000,000	3,000,000
Weighted average risk free rate for environmental liability	2.00%
Environmental Matters [Member] | Operating And Maintenance Component [Member]
Reserve for environmental matters	3,000,000
Expected future payments, 2012	1,000,000
Expected future payments, 2013	1,000,000
Expected future payments, 2014	1,000,000
Expected future payments, 2015	1,000,000
Expected future payments, thereafter	1,000,000
Respirator Liabilities [Member]
Number of claimants	42,000	45,000
Annual fees paid by transferee to transferor company	400,000
Respirator reserve on discounted basis		11,000,000
Respirator reserve on undiscounted basis		16,000,000
Discount rate	5.30%
Expected aggregate undiscounted amount of future payments, fiscal 2011	2,000,000
Expected aggregate undiscounted amount of future payments, fiscal 2012	1,000,000
Expected aggregate undiscounted amount of future payments, fiscal 2013	1,000,000
Expected aggregate undiscounted amount of future payments, fiscal 2014	1,000,000
Expected aggregate undiscounted amount of future payments, fiscal 2015	1,000,000
Expected aggregate undiscounted amount of future payments, fiscal 2016 through 2062	10,000,000
Cash payments for respirator reserves		5,000,000	2,000,000	2,000,000
Feedstock Pipeline Breakage [Member]
Benefit From Legal Judgment	9,000,000
Non-Controlling Interests [Member]
Raw materials purchases	134,000,000	126,000,000	57,000,000
Accounts payable and accrued liabilities	$ 10,000,000	$ 10,000,000