Credit Facilities, Short-term Borrowings and Long-term Debt (Short-term Borrowings and Availability Under Various Short-term Credit Facilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Line Of Credit Facility [Line Items]
Total availability	$ 1,007,907
Outstanding letters of credit and guarantees	(11,178)
Remaining availability	996,729
Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Total availability	1,000,000
Outstanding letters of credit and guarantees	(10,961)
Outstanding borrowings	0	$ 0
Remaining availability	989,039
Foreign Lines of Credit and Overdraft Facilities [Member]
Line Of Credit Facility [Line Items]
Total availability	7,413
Remaining availability	7,413
Foreign Performance Guarantee Facilities [Member]
Line Of Credit Facility [Line Items]
Total availability	494
Outstanding letters of credit and guarantees	(217)
Remaining availability	$ 277