CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Statement - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock, Common [Member]
Balance, beginning of period (value) at Jun. 30, 2021			$ 1,038	$ 518,960	$ 2,412,496	$ (1,613,202)
Shares, beginning of period at Jun. 30, 2021			103,795,169
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for equity-based payment arrangements (shares)			41,586
Shares issued for Employee Stock Purchase Plan (shares)			59,179
Shares issued for Employee Stock Purchase Plan (value)			$ 1	8,523
Tax withholding related to share-based compensation				(3,709)
Stock-based compensation expense				19,303
Net Income	$ 282,490				282,490
Dividends					(103,376)
Purchase of treasury shares						(193,916)
Balance, end of period (value) at Mar. 31, 2022	$ 1,328,608		$ 1,039	543,077	2,591,610	(1,807,118)
Shares, end of period at Mar. 31, 2022			103,895,934
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 1.41
Balance, beginning of period (value) at Dec. 31, 2021			$ 1,039	535,493	2,542,583	(1,807,118)
Shares, beginning of period at Dec. 31, 2021			103,860,246
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for equity-based payment arrangements (shares)			15,053
Shares issued for Employee Stock Purchase Plan (shares)			20,635
Shares issued for Employee Stock Purchase Plan (value)			$ 0	3,019
Tax withholding related to share-based compensation				(1,711)
Stock-based compensation expense				6,276
Net Income	$ 84,707				84,707
Dividends					(35,680)
Purchase of treasury shares						0
Balance, end of period (value) at Mar. 31, 2022	$ 1,328,608		$ 1,039	543,077	2,591,610	(1,807,118)
Shares, end of period at Mar. 31, 2022			103,895,934
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 0.49
Preferred Shares		0
Balance, beginning of period (value) at Jun. 30, 2022	$ 1,381,623		$ 1,039	551,360	2,636,342	(1,807,118)
Shares, beginning of period at Jun. 30, 2022			103,921,724
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for equity-based payment arrangements (shares)			59,177
Shares issued for Employee Stock Purchase Plan (shares)			79,744
Shares issued for Employee Stock Purchase Plan (value)			$ 1	9,005
Tax withholding related to share-based compensation				(8,306)
Stock-based compensation expense				21,459
Net Income	268,873				268,873
Dividends					(109,346)
Purchase of treasury shares						(25,000)
Balance, end of period (value) at Mar. 31, 2023	$ 1,538,309		$ 1,040	573,518	2,795,869	(1,832,118)
Shares, end of period at Mar. 31, 2023			104,060,645
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 1.50
Balance, beginning of period (value) at Dec. 31, 2022			$ 1,040	564,856	2,752,212	(1,807,118)
Shares, beginning of period at Dec. 31, 2022			104,027,008
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for equity-based payment arrangements (shares)			9,660
Shares issued for Employee Stock Purchase Plan (shares)			23,977
Shares issued for Employee Stock Purchase Plan (value)			$ 0	3,322
Tax withholding related to share-based compensation				(1,575)
Stock-based compensation expense				6,915
Net Income	$ 81,549				81,549
Dividends					(37,892)
Purchase of treasury shares						(25,000)
Balance, end of period (value) at Mar. 31, 2023	$ 1,538,309		$ 1,040	$ 573,518	$ 2,795,869	$ (1,832,118)
Shares, end of period at Mar. 31, 2023			104,060,645
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 0.52
Preferred Shares		0