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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, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2016
Jun. 30, 2015
Part A Restricted Stock Units [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of RSUs, Outstanding beginning balance     933,217       933,217  
Number of RSUs, Granted             1,636,462  
Number of RSUs, Vested             (444,249)  
Number of RSUs, Forfeited             (72,473)  
Number of RSUs, Outstanding ending balance 2,052,957     933,217     2,052,957 933,217
Weighted average grant-date fair value per share, Outstanding beginning balance     $ 26.25       $ 26.25  
Weighted average grant-date fair value per share, Granted             25.36  
Weighted average grant-date fair value per share, vested             $ 26.25  
Weighted average remaining contractual term in months             8 months 7 months 3 days
Weighted average grant-date fair value per share, Outstanding ending balance $ 25.50     $ 26.25     $ 25.50 $ 26.25
Part B Restricted Stock Units [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of RSUs, Outstanding beginning balance     1,249,873       1,249,873  
Number of RSUs, Granted 284,773 282,074 272,813 316,353 359,658 575,660 806,309  
Number of RSUs, Vested             (1,210,176)  
Number of RSUs, Forfeited             (39,697)  
Number of RSUs, Outstanding ending balance 806,309     1,249,873     806,309 1,249,873
Weighted average grant-date fair value per share, Outstanding beginning balance     $ 42.91       $ 42.91  
Weighted average grant-date fair value per share, Granted $ 25.12 $ 18.08 $ 17.83 $ 27.10 $ 24.36 $ 63.12 22.86  
Weighted average grant-date fair value per share, vested             $ 43.47  
Weighted average remaining contractual term in months             6 months 3 days 5 months 15 days
Weighted average grant-date fair value per share, Outstanding ending balance $ 22.86     $ 42.91     $ 22.86 $ 42.91