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Stock-Based Compensation (Summary Of Restricted Stock Units Activity) (Details) - $ / shares
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Mar. 31, 2017
Jun. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of RSUs, Granted 171,316 191,015 200,425 312,516 284,773 282,074 272,813    
Weighted average grant-date fair value per share, Granted $ 27.39 $ 75.56 $ 47.00 $ 37.03 $ 25.12 $ 25.26 $ 17.83    
Part A Restricted Stock Units [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of RSUs, Outstanding beginning balance     2,169,901         2,169,901  
Number of RSUs, Granted               1,988,570  
Number of RSUs, Vested               (1,475,020)  
Number of RSUs, Forfeited               (290,860)  
Number of RSUs, Outstanding ending balance 2,392,591     2,169,901       2,392,591 2,169,901
Weighted average grant-date fair value per share, Outstanding beginning balance     $ 26.04         $ 26.04  
Weighted average grant-date fair value per share, Granted               31.56  
Weighted average grant-date fair value per share, vested               25.29  
Weighted average grant-date fair value per share, Forfeited               0.00  
Weighted average grant-date fair value per share, Outstanding ending balance $ 30.67     $ 26.04       $ 30.67 $ 26.04
Weighted average remaining contractual term in months               7 months 6 days 7 months 27 days
Part B Restricted Stock Units [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Number of RSUs, Outstanding beginning balance     860,936         860,936  
Number of RSUs, Granted               562,756  
Number of RSUs, Vested               (652,532)  
Number of RSUs, Forfeited               (211,398)  
Number of RSUs, Outstanding ending balance 559,762     860,936       559,762 860,936
Weighted average grant-date fair value per share, Outstanding beginning balance     $ 29.50         $ 29.50  
Weighted average grant-date fair value per share, Granted               50.72  
Weighted average grant-date fair value per share, vested               29.46  
Weighted average grant-date fair value per share, Forfeited               0.00  
Weighted average grant-date fair value per share, Outstanding ending balance $ 50.72     $ 29.50       $ 50.72 $ 29.50
Weighted average remaining contractual term in months               5 months 24 days 6 months 6 days