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Stock-Based Compensation (Summary Of Part B RSUs Granted, Maximum Eligible Shares Of Stock And Grant Date Fair Value Per Part B RSU) (Details) - $ / shares
3 Months Ended 6 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Part B RSUs granted 191,015 200,425 312,516 284,773 282,074 272,813  
Maximum eligible shares of the Company's common stock 981,817 1,030,185 1,606,332 1,463,733 1,449,860 1,426,812 981,817
Grant date fair value $ 75.56 $ 47.00 $ 37.03 $ 25.12 $ 25.26 $ 17.83  
Units converted to the Company's common stock       475,446 40,182    
Part B Restricted Stock Units [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Part B RSUs granted             391,440
Grant date fair value             $ 60.94