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Debt (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
	May 14, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Debt Instrument [Line Items]
Revolving credit facility		$ 330,000,000
Available to borrow under the credit facility		320,000,000
Option amount to increase credit facility		250,000,000
Cash on hand		30,215,000	34,158,000	26,508,000	44,630,000
Current portion of long-term debt		50,000,000	50,000,000
Credit facility, maturity date		Nov. 01, 2012
Number of lenders	8
Percentage of foreign subsidiaries' share equity		65.00%
Maximum aggregate short-term borrowings at any month-end		141,000,000	159,000,000
Average aggregate short-term borrowings outstanding		126,000,000	143,000,000
Weighted average interest rates		1.20%	1.40%	1.87%
Letters of credit issued and outstanding		15,300,000	15,000,000
Maximum [Member]
Debt Instrument [Line Items]
Incremental term loan		250,000,000
Credit facility fees		0.35%
Minimum [Member]
Debt Instrument [Line Items]
Incremental term loan		25,000,000
Credit facility fees		0.175%
JPMorgan Chase Bank N.A. [Member]
Debt Instrument [Line Items]
Revolving credit facility	450,000,000
Revolving credit facility period	5 years

X

- Definition

Facility secured by pledge of the material foreign subsidiaries' share equity.

+ References

No definition available.

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- Definition

Line of credit facility, incremental term loan.

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- Definition

Line of credit facility, number of lenders.

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- Definition

Line of credit facility, period of facility, years.

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- Definition

Option To Increase Credit Facility

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.

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Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of short-term debt outstanding by type or by instrument at that time.

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