Credit Facilities and Short-term Borrowings (Narrative) (Details) (USD $) In Thousands						12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Foreign Pooling Arrangement Facility [Member]	Sep. 30, 2011 Foreign Performance Guarantee Facilities [Member]	Sep. 30, 2011 Foreign Lines of Credit And Overdraft Facilities [Member]	Sep. 30, 2011 Revolving Credit Facility [Member]
Maximum borrowing capacity	$ 250,541		$ 5,279	$ 9,736	$ 10,526	$ 225,000
Option to increase maximum borrowings to this amount						350,000
Line of Credit Facility, Expiration Date						October 2012
Cross default provisions related to the Company's other outstanding debt arrangements in excess of this amount, the occurrence of which would permit the lenders to accelerate the amounts due thereunder						15,000
Short-term borrowings	$ 0	$ 22,099