Financial Instruments (Options Contract) (Narrative) (Details) In Millions	12 Months Ended
Sep. 30, 2011 Forward Exchange Contracts [Member]	Sep. 30, 2011 Foreign Currency Debt [Member] EUR (€)	Sep. 30, 2010 Foreign Currency Debt [Member] TWD	Sep. 30, 2010 Foreign Currency Debt [Member] EUR (€)	Sep. 30, 2011 Intercompany Loan [Member] EUR (€)	Sep. 30, 2010 Intercompany Loan [Member] EUR (€)
Amounts included in designated foreign currency denominated debt		€ 742.1	967.0	€ 782.1
Amounts included in qualifying intercompany loans					€ 437.0	€ 437.0
Maximum length of time of hedged exposures, years	1.9

For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading.

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+ Details