CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Statement - USD ($) $ in Thousands	Total	PREFERRED SHARES	COMMON SHARES	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	TREASURY STOCK
Balance, beginning of period at Jun. 30, 2020			$ 1,036	$ 495,005	$ 2,235,320	$ (1,181,673)
Balance, beginning of period (Accounting Standards Update 2016-13) at Jun. 30, 2020					(493)
Shares, beginning of period at Jun. 30, 2020			103,622,563
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for equity-based payment arrangements			78,414
Shares issued for Employee Stock Purchase Plan			35,726
Shares issued for equity-based payment arrangements			$ (1)	(1)
Tax withholding related to share-based compensation				(6,689)
Shares issued for Employee Stock Purchase Plan			0	5,138
Stock-based compensation expense				9,752
Net Income	$ 163,198				163,198
Dividends					(65,516)
Purchase of treasury shares						(109,899)
Balance, end of period at Dec. 31, 2020	$ 1,545,179		$ 1,037	503,205	2,332,509	(1,291,572)
Shares, end of period at Dec. 31, 2020			103,736,703
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 0.86
Balance, beginning of period at Sep. 30, 2020			$ 1,037	497,030	2,293,229	(1,247,546)
Balance, beginning of period (Accounting Standards Update 2016-13) at Sep. 30, 2020					0
Shares, beginning of period at Sep. 30, 2020			103,696,962
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for equity-based payment arrangements			23,412
Shares issued for Employee Stock Purchase Plan			16,329
Shares issued for equity-based payment arrangements			$ 0	0
Tax withholding related to share-based compensation				(1,184)
Shares issued for Employee Stock Purchase Plan			0	2,232
Stock-based compensation expense				5,127
Net Income	$ 71,982				71,982
Dividends					(32,702)
Purchase of treasury shares						(44,026)
Balance, end of period at Dec. 31, 2020	$ 1,545,179		$ 1,037	503,205	2,332,509	(1,291,572)
Shares, end of period at Dec. 31, 2020			103,736,703
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 0.43
Preferred Shares		0
Balance, beginning of period at Jun. 30, 2021	$ 1,319,292		$ 1,038	518,960	2,412,496	(1,613,202)
Balance, beginning of period (Accounting Standards Update 2016-13) at Jun. 30, 2021					0
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			26,533
Shares issued for Employee Stock Purchase Plan			38,544
Shares issued for equity-based payment arrangements			$ 0	0
Tax withholding related to share-based compensation				(1,998)
Shares issued for Employee Stock Purchase Plan			1	6,476
Stock-based compensation expense				12,055
Net Income	197,783				197,783
Dividends					(67,696)
Purchase of treasury shares						(193,917)
Balance, end of period at Dec. 31, 2021	$ 1,271,996		$ 1,039	535,493	2,542,583	(1,807,119)
Shares, end of period at Dec. 31, 2021			103,860,246
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 0.92
Balance, beginning of period at Sep. 30, 2021			$ 1,038	527,255	2,480,574	(1,613,202)
Balance, beginning of period (Accounting Standards Update 2016-13) at Sep. 30, 2021					0
Shares, beginning of period at Sep. 30, 2021			103,822,265
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for equity-based payment arrangements			21,101
Shares issued for Employee Stock Purchase Plan			16,880
Shares issued for equity-based payment arrangements			$ 0	0
Tax withholding related to share-based compensation				(1,046)
Shares issued for Employee Stock Purchase Plan			1	2,739
Stock-based compensation expense				6,545
Net Income	$ 95,670				95,670
Dividends					(33,661)
Purchase of treasury shares						(193,917)
Balance, end of period at Dec. 31, 2021	$ 1,271,996		$ 1,039	$ 535,493	$ 2,542,583	$ (1,807,119)
Shares, end of period at Dec. 31, 2021			103,860,246
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 0.46
Preferred Shares		0