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 [Member]
Balance, beginning of period (value) at Jun. 30, 2018			$ 1,033	$ 464,138	$ 1,912,933	$ (1,055,260)
Shares, beginning of period at Jun. 30, 2018			103,278,562
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for equity-based payment arrangements (value)			$ (1)	(1)
Shares issued for equity-based payment arrangements (shares)			102,094
Tax withholding related to share-based compensation				(13,256)
Shares issued for Employee Stock Purchase Plan (value)				2,217
Shares issued for Employee Stock Purchase Plan (shares)			17,845
Stock-based compensation expense				1,771
Net Income	$ 83,551				83,551
Dividends (value)					(28,563)
Purchase of treasury shares						0
Balance, end of period (value) at Sep. 30, 2018	$ 1,368,564		$ 1,034	454,869	1,967,921	(1,055,260)
Shares, end of period at Sep. 30, 2018			103,398,501
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 0.37
Preferred Shares		0
Balance, beginning of period (value) at Jun. 30, 2019	$ 1,429,013		$ 1,035	472,030	2,066,073	(1,110,124)
Shares, beginning of period at Jun. 30, 2019			103,496,026
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for equity-based payment arrangements (value)			$ 0	(1)
Shares issued for equity-based payment arrangements (shares)			19,888
Tax withholding related to share-based compensation				(2,072)
Shares issued for Employee Stock Purchase Plan (value)				2,412
Shares issued for Employee Stock Purchase Plan (shares)			19,914
Stock-based compensation expense				2,853
Net Income	89,370				89,370
Dividends (value)					(30,771)
Purchase of treasury shares						(14,145)
Balance, end of period (value) at Sep. 30, 2019	$ 1,476,660		$ 1,035	$ 475,222	$ 2,124,672	$ (1,124,269)
Shares, end of period at Sep. 30, 2019			103,535,828
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 0.40
Preferred Shares		0