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Stock-Based Compensation (Summary Of Restricted Stock Units Activity) (Details) - $ / shares
3 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Number of RSUs, Granted                 47,420 41,793  
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       933,217 2,169,901 933,217
Number of RSUs, Granted                 2,678,503 2,190,785 955,831
Number of RSUs, Vested                 (2,080,685) (852,853)  
Number of RSUs, Forfeited                 (403,333) (101,248) (22,614)
Number of RSUs, Outstanding ending balance 2,364,386       2,169,901       2,364,386 2,169,901 933,217
Weighted average grant-date fair value per share, Outstanding beginning balance       $ 26.04       $ 26.25 $ 26.04 $ 26.25
Weighted average grant-date fair value per share, Granted                 31.64 26.04 26.25
Weighted average grant-date fair value per share, vested                 26.03 26.14  
Weighted average grant-date fair value per share, Outstanding ending balance $ 31.63       $ 26.04       $ 31.63 $ 26.04 $ 26.25
Weighted average remaining contractual term in months                 7 months 3 days 7 months 27 days 7 months 3 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       1,249,873 860,936 1,249,873  
Number of RSUs, Granted 152,808 171,316 191,015 200,425 312,516 284,773 282,074 272,813 715,564 1,152,176 1,251,671
Number of RSUs, Vested                 (793,478) (1,463,893)  
Number of RSUs, Forfeited                 (371,049) (77,220) (1,798)
Number of RSUs, Outstanding ending balance 411,973       860,936       411,973 860,936 1,249,873
Weighted average grant-date fair value per share, Outstanding beginning balance       $ 29.50       $ 42.90 $ 29.50 $ 42.90  
Weighted average grant-date fair value per share, Granted $ 26.52 $ 27.39 $ 75.56 $ 47.00 $ 37.03 $ 25.12 $ 25.26 $ 17.83 45.56 26.80 $ 42.90
Weighted average grant-date fair value per share, vested                 32.58 38.70  
Weighted average grant-date fair value per share, Outstanding ending balance $ 42.86       $ 29.50       $ 42.86 $ 29.50 $ 42.90
Weighted average remaining contractual term in months                 6 months 3 days 6 months 6 days 5 months 15 days