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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 01, 2019
Dec. 31, 2019
Jun. 30, 2019
Sep. 30, 2018
Summary Of Significant Accounting Policies [Line Items]        
ROU assets   $ 96,745    
Lease liabilities   $ 99,496    
Cumulative effect of change in accounting standards       $ (188,799)
Estimated discount rate     3.50%  
ASU 2016-02 [Member]        
Summary Of Significant Accounting Policies [Line Items]        
ROU assets $ 77,600      
Lease liabilities 81,300      
Derecognized deferred rent 3,700      
Cumulative effect of change in accounting standards 77,600      
Minimum [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Deferred revenue recognized over a period of   1 year    
Additional ROU assets and lease liabilities due to guidance 60,000      
Maximum [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Deferred revenue recognized over a period of   5 years    
Additional ROU assets and lease liabilities due to guidance $ 70,000