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Credit Facilities, Short-term Borrowings and Long-term Debt (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2020
Nov. 25, 2020
Sep. 30, 2020
Notes Payable to Banks [Member] | Series J Notes [Member]      
Debt Instrument [Line Items]      
Borrowings principal payment   $ 100,000  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity $ 1,000,000    
Line of credit facility, maximum borrowing capacity extension 1,500,000    
Outstanding borrowings 0   $ 0
Foreign Lines of Credit And Overdraft Facilities [Member]      
Debt Instrument [Line Items]      
Short-term borrowings $ 0   $ 0
Minimum [Member] | LIBOR [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.875%    
Maximum [Member] | LIBOR [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.75%