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Capitalization And Short-Term Borrowings (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 03, 2020
Aug. 17, 2018
Sep. 27, 2017
Debt Instrument [Line Items]          
Total Long-Term Debt $ 2,649,000 $ 2,149,000      
Less Unamortized Discount and Debt Issuance Costs 19,424 15,282      
Less Current Portion [1] 0 0      
Long-term Debt, Net of Current Portion and Unamortized Discount and Debt Issuance Costs $ 2,629,576 2,133,718      
4.75% Notes Due September 1, 2028 [Member]          
Debt Instrument [Line Items]          
Long-term debt, face value       $ 300,000  
Long-term debt, interest rate       4.75%  
Maximum interest rate adjustment 2.00%        
3.95% Notes Due September 15, 2027 [Member]          
Debt Instrument [Line Items]          
Long-term debt, face value         $ 300,000
Long-term debt, interest rate         3.95%
Maximum interest rate adjustment 2.00%        
7.4% Due March 2023 To June 2025 [Member]          
Debt Instrument [Line Items]          
Medium-Term Notes [2] $ 99,000 $ 99,000      
Long-term debt, interest rate 7.40% 7.40%      
3.75% To 5.50% Due December 2021 To September 2028 [Member]          
Debt Instrument [Line Items]          
Notes [2],[3],[4] $ 2,550,000 $ 2,050,000      
Percentage of principal amount 101.00% 101.00%      
5.50% Notes Due January 15, 2026 [Member]          
Debt Instrument [Line Items]          
Long-term debt, face value     $ 500,000    
Long-term debt, interest rate     5.50%    
Maximum interest rate adjustment 2.00%        
Minimum [Member] | 3.75% To 5.50% Due December 2021 To September 2028 [Member]          
Debt Instrument [Line Items]          
Long-term debt, interest rate 3.75% 3.75%      
Maximum [Member] | 3.75% To 5.50% Due December 2021 To September 2028 [Member]          
Debt Instrument [Line Items]          
Long-term debt, interest rate 5.50% 5.50%      
Maximum [Member] | 5.50% Notes Due January 15, 2026 [Member]          
Debt Instrument [Line Items]          
Long-term debt, interest rate 7.50%        
[1] None of the Company's long-term debt at September 30, 2020 and 2019 will mature within the following twelve-month period.
[2] The Medium-Term Notes and Notes are unsecured.
[3] The interest rate payable on $300.0 million of 4.75% notes and $300.0 million of 3.95% notes will be subject to adjustment from time to time, with a maximum of 2.00%, if certain change of control events involving a material subsidiary result in a downgrade of the credit rating assigned to the notes to below investment grade (or if the credit rating assigned to the notes is subsequently upgraded). The interest rate payable on $500.0 million of 5.50% notes will be subject to a maximum adjustment of 2.00% such that the coupon will not exceed 7.5% if there is a downgrade of the credit rating assigned to the notes. A downgrade with a resulting increase to the coupon does not preclude the coupon from returning to its original rate if the Company's credit rating is subsequently upgraded.
[4] The holders of these notes may require the Company to repurchase their notes at a price equal to 101% of the principal amount in the event of both a change in control and a ratings downgrade to a rating below investment grade.