Condensed Consolidated Statements Of Changes In Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member] Cumulative Effect Of Change In Accounting Standards [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Cumulative Effect Of Change In Accounting Standards [Member]	Total
Beginning balance at Jun. 30, 2020	$ 580	$ 1,570,694	$ (1,623,256)		$ 2,832,991	$ (283,982)		$ 2,497,027
Beginning balance, shares at Jun. 30, 2020	186,723		(41,836)
Common stock issued on exercise of options		1,026						1,026
Common stock issued on exercise of options, shares	18
Common stock issued on vesting of restricted stock units, net of shares withheld for tax		227						227
Common stock issued on vesting of restricted stock units, net of shares withheld for tax, shares	3
Stock-based compensation costs		16,071						16,071
Other comprehensive income (loss)						43,791		43,791
Net income					178,372			178,372
Dividends declared					(56,511)			(56,511)
Ending balance at Sep. 30, 2020	$ 580	1,588,018	$ (1,623,256)	$ (1,143)	2,953,709	(240,191)	$ (1,143)	2,678,860
Ending balance, shares at Sep. 30, 2020	186,744		(41,836)
Beginning balance at Jun. 30, 2020	$ 580	1,570,694	$ (1,623,256)		2,832,991	(283,982)		2,497,027
Beginning balance, shares at Jun. 30, 2020	186,723		(41,836)
Net income								357,886
Ending balance at Dec. 31, 2020	$ 582	1,574,240	$ (1,623,256)		3,076,569	(163,151)		2,864,984
Ending balance, shares at Dec. 31, 2020	187,340		(41,836)
Beginning balance at Sep. 30, 2020	$ 580	1,588,018	$ (1,623,256)	$ (1,143)	2,953,709	(240,191)	$ (1,143)	2,678,860
Beginning balance, shares at Sep. 30, 2020	186,744		(41,836)
Common stock issued on exercise of options		1,857						1,857
Common stock issued on exercise of options, shares	29
Common stock issued on vesting of restricted stock units, net of shares withheld for tax	$ 2	(46,734)						(46,732)
Common stock issued on vesting of restricted stock units, net of shares withheld for tax, shares	451
Common stock issued on employee stock purchase plan		15,729						15,729
Common stock issued on employee stock purchase plan, shares	116
Stock-based compensation costs		15,370						15,370
Other comprehensive income (loss)						77,040		77,040
Net income					179,514			179,514
Dividends declared					(56,654)			(56,654)
Ending balance at Dec. 31, 2020	$ 582	1,574,240	$ (1,623,256)		3,076,569	(163,151)		2,864,984
Ending balance, shares at Dec. 31, 2020	187,340		(41,836)
Beginning balance at Jun. 30, 2021	$ 583	1,622,199	$ (1,623,256)		3,079,640	(193,487)		2,885,679
Beginning balance, shares at Jun. 30, 2021	187,485		(41,836)
Common stock issued on exercise of options		4,354						4,354
Common stock issued on exercise of options, shares	61
Common stock issued on vesting of restricted stock units, net of shares withheld for tax		(195)						(195)
Common stock issued on vesting of restricted stock units, net of shares withheld for tax, shares	1
Stock-based compensation costs		17,303						17,303
Other comprehensive income (loss)						(23,516)		(23,516)
Net income					203,613			203,613
Dividends declared					(61,189)			(61,189)
Ending balance at Sep. 30, 2021	$ 583	1,643,661	$ (1,623,256)		3,222,064	(217,003)		3,026,049
Ending balance, shares at Sep. 30, 2021	187,547		(41,836)
Beginning balance at Jun. 30, 2021	$ 583	1,622,199	$ (1,623,256)		3,079,640	(193,487)		2,885,679
Beginning balance, shares at Jun. 30, 2021	187,485		(41,836)
Net income								405,364
Ending balance at Dec. 31, 2021	$ 585	1,629,031	$ (1,623,256)		3,362,570	(223,095)		3,145,835
Ending balance, shares at Dec. 31, 2021	188,048		(41,836)
Beginning balance at Sep. 30, 2021	$ 583	1,643,661	$ (1,623,256)		3,222,064	(217,003)		3,026,049
Beginning balance, shares at Sep. 30, 2021	187,547		(41,836)
Common stock issued on exercise of options		2,378						2,378
Common stock issued on exercise of options, shares	39
Common stock issued on vesting of restricted stock units, net of shares withheld for tax	$ 2	(49,832)						(49,830)
Common stock issued on vesting of restricted stock units, net of shares withheld for tax, shares	361
Common stock issued on employee stock purchase plan		16,723						16,723
Common stock issued on employee stock purchase plan, shares	101
Stock-based compensation costs		16,101						16,101
Other comprehensive income (loss)						(6,092)		(6,092)
Net income					201,751			201,751
Dividends declared					(61,245)			(61,245)
Ending balance at Dec. 31, 2021	$ 585	$ 1,629,031	$ (1,623,256)		$ 3,362,570	$ (223,095)		$ 3,145,835
Ending balance, shares at Dec. 31, 2021	188,048		(41,836)