Stockholders' Equity (Schedule Of Option Activity) (Details) - $ / shares	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Stockholders' Equity [Abstract]
Options, Outstanding at beginning of period	1,205,826
Options, Granted	306,842
Options, Exercised	(252,371)
Options, Forfeited	(183)
Options, Outstanding at end of period	1,260,114	1,205,826
Options, Exercise price of granted options	$ 102.12
Options exercisable at end of period	704,466
Weighted Average Exercise Price, Outstanding at beginning of period	$ 60.48
Weighted Average Exercise Price, Granted	102.12
Weighted Average Exercise Price, Exercised	49.04
Weighted Average Exercise Price, Forfeited	52.02
Weighted Average Exercise Price, Outstanding at end of period	72.91	$ 60.48
Weighted Average Exercise Price, Options exercisable at end of period	$ 59.31
Weighted Average Remaining Contractual Term in Years, Outstanding	4 years 4 months 24 days	4 years 4 months 24 days
Exercisable shares, netted for tax	0