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Debt And Borrowings (Credit Agreement) (Details) - Amended Credit Agreement [Member]
3 Months Ended 9 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
Jun. 30, 2019
USD ($)
Feb. 06, 2018
USD ($)
Unsecured revolving credit facility [Member]                  
Line of Credit Facility [Line Items]                  
Revolving credit facility                 $ 1,000,000,000
Line of credit facility outstanding         $ 362,169,000 $ 362,169,000   $ 420,575,000  
Letters of credit outstanding         $ 9,698,000 9,698,000      
Write off of unamortized issuance costs           973,000      
Term Loan [Member]                  
Line of Credit Facility [Line Items]                  
Revolving credit facility                 300,000,000
Additional borrowing capacity                 $ 400,000,000
Consolidated leverage ratio         4.50   4.75    
Interest coverage ratio         3.0        
Available borrowing capacity         $ 628,133,000 $ 628,133,000      
Weighted average interest rate         2.51% 2.51%      
Term Loan [Member] | Minimum [Member]                  
Line of Credit Facility [Line Items]                  
Commitment fee percentage           0.20%      
Term Loan [Member] | Maximum [Member]                  
Line of Credit Facility [Line Items]                  
Commitment fee percentage           0.45%      
Term Loan [Member] | Forecast [Member]                  
Line of Credit Facility [Line Items]                  
Consolidated leverage ratio     3.75 4.0          
Interest coverage ratio 4.0 3.75              
Term Loan [Member] | Eurocurrency Rate [Member] | Minimum [Member]                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate           0.875%      
Term Loan [Member] | Eurocurrency Rate [Member] | Maximum [Member]                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate           2.50%      
Term Loan [Member] | Base Rate [Member] | Minimum [Member]                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate           0.00%      
Term Loan [Member] | Base Rate [Member] | Maximum [Member]                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate           1.50%