Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	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
Earnings Per Share [Abstract]
Net income	$ 313	$ 31,328	$ 27,185	$ 8,604	$ (88,597)	$ 48,788	$ 58,080	$ 29,158	$ 67,430	$ 47,429	$ 164,962
Denominator:
Basic weighted average shares outstanding (shares)									103,611	103,135	101,703
Effect of dilutive stock options, unvested restricted stock and unvested restricted share units (shares)									637	1,048	1,718
Diluted weighted average shares outstanding (shares)									104,248	104,183	103,421
Basic (USD per share)	$ 0.00	$ 0.30	$ 0.26	$ 0.08	$ (0.86)	$ 0.47	$ 0.56	$ 0.28	$ 0.65	$ 0.46	$ 1.62
Diluted (USD per share)	$ 0.00	$ 0.30	$ 0.26	$ 0.08	$ (0.86)	$ 0.47	$ 0.56	$ 0.28	$ 0.65	$ 0.46	$ 1.60