Debt (Narrative) (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	May 14, 2012	Sep. 30, 2011
Debt Instrument [Line Items]
Revolving credit facility				$ 330,000,000
Available to borrow under the credit facility	399,000,000
Cash on hand	35,131,000	42,850,000	30,215,000		34,158,000
Percentage of foreign subsidiaries' share equity	65.00%
Letters of Credit Outstanding, Amount	11,000,000	13,000,000
Line of Credit Facility, Amount Outstanding	20,000,000
Maximum aggregate short-term borrowings at any month-end	187,000,000	191,000,000
Average aggregate short-term borrowings outstanding	103,000,000	171,000,000
Weighted average interest rates	1.48%	1.55%	1.20%
Minimum [Member]
Debt Instrument [Line Items]
Incremental term loan				25,000,000
Credit facility fees	17.50%
Maximum [Member]
Debt Instrument [Line Items]
Incremental term loan	250,000,000			250,000,000
Credit facility fees	35.00%
JPMorgan Chase Bank N.A. [Member]
Debt Instrument [Line Items]
Revolving credit facility				450,000,000
Line Of Credit Facility Additional Borrowing Capacity				$ 250,000,000