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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jul. 01, 2020
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Summary Of Significant Accounting Policies [Line Items]          
Adjustment to retained earnings $ 2,678,860   $ 2,497,027 $ 2,117,251 $ 2,072,193
Retained Earnings [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Adjustment to retained earnings 2,953,709   $ 2,832,991 $ 2,500,506 $ 2,436,410
Cumulative Effect Of Change In Accounting Standards [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Adjustment to retained earnings (1,143)        
Cumulative Effect Of Change In Accounting Standards [Member] | Retained Earnings [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Adjustment to retained earnings $ (1,143)        
Cumulative Effect Of Change In Accounting Standards [Member] | Accounting Standards Update 2016-13 [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Adjustment to retained earnings   $ 1,100