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, 2022			$ 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 equity-based payment arrangements (value)			$ 0
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 equity-based payment arrangements (value)			$ 0
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
Balance, beginning of period (value) at Jun. 30, 2023	$ 1,608,510		$ 1,041	583,836	2,855,751	(1,832,118)
Shares, beginning of period at Jun. 30, 2023			104,088,784
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for equity-based payment arrangements (shares)			65,042
Shares issued for Employee Stock Purchase Plan (shares)			68,906
Shares issued for equity-based payment arrangements (value)			$ 1
Shares issued for Employee Stock Purchase Plan (value)			0	9,408
Tax withholding related to share-based compensation				(5,343)
Stock-based compensation expense				22,404
Net Income	280,743				280,743
Dividends					(115,792)
Purchase of treasury shares						(20,000)
Balance, end of period (value) at Mar. 31, 2024	$ 1,779,931		$ 1,042	610,305	3,020,702	(1,852,118)
Shares, end of period at Mar. 31, 2024			104,222,732
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 1.59
Balance, beginning of period (value) at Dec. 31, 2023			$ 1,042	601,790	2,973,673	(1,852,118)
Shares, beginning of period at Dec. 31, 2023			104,181,060
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for equity-based payment arrangements (shares)			17,382
Shares issued for Employee Stock Purchase Plan (shares)			24,290
Shares issued for equity-based payment arrangements (value)			$ 0
Shares issued for Employee Stock Purchase Plan (value)			0	3,373
Tax withholding related to share-based compensation				(1,782)
Stock-based compensation expense				6,924
Net Income	$ 87,099				87,099
Dividends					(40,070)
Purchase of treasury shares						0
Balance, end of period (value) at Mar. 31, 2024	$ 1,779,931		$ 1,042	$ 610,305	$ 3,020,702	$ (1,852,118)
Shares, end of period at Mar. 31, 2024			104,222,732
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 0.55
Preferred Shares		0