CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock
Balance, beginning of year (value) at Jun. 30, 2015			$ 1,027	$ 424,536	$ 1,266,443	$ (700,472)
Shares, beginning of year at Jun. 30, 2015			102,695,214
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for equity-based payment arrangements (value)			$ 1	696
Shares issued for equity-based payment arrangements (shares)			121,348
Tax withholding related to share based compensation				(2,590)
Shares issued for Employee Stock Purchase Plan (value)			$ 1	5,710
Shares issued for Employee Stock Purchase Plan (shares)			87,409
Tax benefits from share-based compensation (value)				1,051
Stock-based compensation expense (value)				10,720
Net Income	$ 248,867				248,867
Dividends (value)					(84,118)
Purchase of treasury shares						(175,662)
Balance, end of year (value) at Jun. 30, 2016	$ 996,210		$ 1,029	440,123	1,431,192	(876,134)
Shares, end of year at Jun. 30, 2016			102,903,971
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 1.06
Preferred Shares		0
Shares issued for equity-based payment arrangements (value)			$ 1	(1)
Shares issued for equity-based payment arrangements (shares)			98,781
Tax withholding related to share based compensation				(5,479)
Shares issued for Employee Stock Purchase Plan (value)			$ 1	6,244
Shares issued for Employee Stock Purchase Plan (shares)			80,547
Tax benefits from share-based compensation (value)				0
Stock-based compensation expense (value)				11,129
Net Income	$ 245,793				245,793
Dividends (value)					(91,707)
Purchase of treasury shares						(130,140)
Balance, end of year (value) at Jun. 30, 2017	$ 1,032,051		$ 1,031	452,016	1,585,278	(1,006,274)
Shares, end of year at Jun. 30, 2017			103,083,299
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 1.18
Preferred Shares		0
Shares issued for equity-based payment arrangements (value)			$ 1	174
Shares issued for equity-based payment arrangements (shares)			118,865
Tax withholding related to share based compensation				(7,332)
Shares issued for Employee Stock Purchase Plan (value)			$ 1	7,522
Shares issued for Employee Stock Purchase Plan (shares)			76,398
Tax benefits from share-based compensation (value)				0
Stock-based compensation expense (value)				11,758
Net Income	$ 376,660				376,660
Dividends (value)					(105,021)
Purchase of treasury shares						(48,986)
Balance, end of year (value) at Jun. 30, 2018	$ 1,266,828		$ 1,033	$ 464,138	$ 1,856,917	$ (1,055,260)
Shares, end of year at Jun. 30, 2018			103,278,562
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 1.36
Preferred Shares		0