Stockholders' Equity (Schedule Of Option Activity) (Details) - $ / shares	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Stockholders' Equity [Abstract]
Options, Outstanding at beginning of period	1,495,573
Options, Granted	248,821
Options, Exercised	(538,568)
Options, Forfeited
Options, Outstanding at end of period	1,205,826	1,495,573
Options, Exercise price of granted options	$ 85.42
Options exercisable at end of period	683,620
Weighted Average Exercise Price, Outstanding at beginning of period	$ 47.09
Weighted Average Exercise Price, Granted	85.42
Weighted Average Exercise Price, Exercised	34.83
Weighted Average Exercise Price, Forfeited
Weighted Average Exercise Price, Outstanding at end of period	60.48	$ 47.09
Weighted Average Exercise Price, Options exercisable at end of period	$ 52.26
Weighted Average Remaining Contractual Term in Years, Outstanding	4 years 4 months 24 days	3 years 10 months 24 days
Exercisable shares, netted for tax	0