Earnings (Loss) Per Share (Schedule Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income (loss)	$ (78,481)	$ 179,514	$ 178,372	$ 163,137	$ 160,554	$ 120,148	$ 279,405	$ 443,839
Denominator:
Basic weighted-average common shares outstanding	145,513			144,638			145,217	144,112
Effect of dilutive securities:
Stock options and restricted stock units				1,042			1,177	1,378
Diluted weighted average shares	145,513			145,680			146,394	145,490
Basic earnings (loss) per share	$ (0.54)			$ 1.13			$ 1.92	$ 3.08
Diluted earnings (loss) per share	$ (0.54)			$ 1.12			$ 1.91	$ 3.05