Stockholders' Equity (Schedule Of Option Activity) (Details) - $ / shares	6 Months Ended	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018
Stockholders' Equity [Abstract]
Options, Outstanding at beginning of period	1,205,826
Options, Granted	289,474
Options, Exercised	(47,744)
Options, Forfeited	(183)
Options, Outstanding at end of period	1,447,373	1,205,826
Options, Exercise price of granted options	$ 101.64
Options exercisable at end of period	895,846
Weighted Average Exercise Price, Outstanding at beginning of period	$ 60.48
Weighted Average Exercise Price, Granted	101.64
Weighted Average Exercise Price, Exercised	46.26
Weighted Average Exercise Price, Forfeited	52.02
Weighted Average Exercise Price, Outstanding at end of period	69.18	$ 60.48
Weighted Average Exercise Price, Options exercisable at end of period	$ 56.92
Weighted Average Remaining Contractual Term in Years, Outstanding	4 years 6 months	4 years 4 months 24 days