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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 9 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Part B RSUs granted       152,808 171,316 191,015 200,425  
Maximum eligible shares of the Company's common stock       550,109 880,564 981,817 1,030,185  
Grant date fair value       $ 26.52 $ 27.39 $ 75.56 $ 47.00  
Units converted to Company's common stock at vesting date         41,368 102,511 99,508  
Part B restricted stock units                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Part B RSUs granted 77,218 82,556 163,960         323,734
Maximum eligible shares of the Company's common stock 532,804 569,636 590,256         532,804
Grant date fair value $ 39.53 $ 45.10 $ 19.06         $ 30.58