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								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]
Part B RSUs granted									47,420	41,793
Part B Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Part B 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
Maximum eligible shares of the Company's common stock	550,109	880,564	981,817	1,030,185	1,606,332	1,463,733	1,449,860	1,426,812	550,109	1,606,332
Grant date fair value	$ 26.52	$ 27.39	$ 75.56	$ 47.00	$ 37.03	$ 25.12	$ 25.26	$ 17.83	$ 45.56	$ 26.80	$ 42.90
Units converted to Company's common stock at vesting date				99,508	1,078,812	475,446	40,182