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, 2014			$ 1,024	$ 412,512	$ 1,131,632	$ (577,781)
Shares, beginning of year at Jun. 30, 2014			102,429,926
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for equity-based payment arrangements (value)			$ 2	640
Shares issued for equity-based payment arrangements (shares)			172,661
Tax withholding related to share based compensation				(7,951)
Shares issued for Employee Stock Purchase Plan (value)			$ 1	4,880
Shares issued for Employee Stock Purchase Plan (shares)			92,627
Tax benefits from share-based compensation (value)				4,343
Stock-based compensation expense (value)				10,112
Net Income	$ 211,221				211,221
Dividends (value)					(76,410)
Purchase of treasury shares						(122,691)
Balance, end of year (value) at Jun. 30, 2015	$ 991,534		$ 1,027	424,536	1,266,443	(700,472)
Shares, end of year at Jun. 30, 2015			102,695,214
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share	$ 0.94
Preferred Shares		0
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