Stock-Based Compensation (Schedule Of Stock Option Plans) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Stock-Based Compensation [Abstract]
Shares, Outstanding and exercisable	187	270
Shares, Granted	21	24
Shares, Exercised	(4)	(98)
Shares, Canceled	(16)	(9)
Shares, Outstanding and exercisable	188	187
Weighted Average Exercise Price, Oustanding and exercisable	$ 27.21	$ 22.85
Weighted Average Exercise Price, Granted	45.21	47.45
Weighted Average Exercise Price, Exercised	12.89	20.57
Weighted Average Exercise Price, Canceled	21.26	20.51
Weighted Average Exercise Price, Oustanding and exercisable	$ 30.07	$ 27.21
Aggregate Intrinsic Value	$ 3,159	$ 5,039	$ 4,638