Condensed Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning balance at Jun. 30, 2018	$ 571	$ 1,450,821	$ (1,600,412)	$ 2,432,328	$ (224,328)	$ 2,058,980
Beginning balance, shares at Jun. 30, 2018	184,316,000		(41,636,000)
Common stock issued on exercise of options		513				513
Common stock issued on exercise of options, shares	12,000
Common stock issued on vesting of restricted stock units, net of shares withheld for tax		(141)				(141)
Common stock issued on vesting of restricted stock units, net of shares withheld for tax, shares	2,000
Treasury stock purchases	$ (1)		$ (22,844)			$ (22,845)
Treasury stock purchases, shares			(200,000)			(200,000)
Stock-based compensation costs		12,476				$ 12,476
Other comprehensive income					(12,872)	(12,872)
Net income				105,737		105,737
Dividends declared				(52,793)		(52,793)
Ending balance at Sep. 30, 2018	$ 570	1,463,669	$ (1,623,256)	2,296,473	(237,200)	1,900,256
Ending balance, shares at Sep. 30, 2018	184,330,000		(41,836,000)
Cumulative effect of change in accounting standards				(188,799)		(188,799)
Beginning balance at Jun. 30, 2019	$ 575	1,511,473	$ (1,623,256)	2,436,410	(253,009)	2,072,193
Beginning balance, shares at Jun. 30, 2019	185,491,000		41,836,000
Common stock issued on exercise of options		5,609				$ 5,609
Common stock issued on exercise of options, shares	110,000					110,379
Common stock issued on vesting of restricted stock units, net of shares withheld for tax		(327)				$ (327)
Common stock issued on vesting of restricted stock units, net of shares withheld for tax, shares	4,000
Treasury stock purchases						$ (1,600,000)
Treasury stock purchases, shares						(41,800,000)
Stock-based compensation costs		13,256				$ 13,256
Other comprehensive income					(37,576)	(37,576)
Net income				120,148		120,148
Dividends declared				(56,052)		(56,052)
Ending balance at Sep. 30, 2019	$ 575	$ 1,530,011	$ (1,623,256)	$ 2,500,506	$ (290,585)	$ 2,117,251
Ending balance, shares at Sep. 30, 2019	185,605,000		41,836,000