CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Total
Beginning Balance at Jun. 30, 2016	$ 765	$ 372,175	$ 1,771,068	$ (42,467)	$ (519,454)	$ 1,582,087
Net income			122,283			122,283
Foreign currency translation				(16,845)		(16,845)
Unrealized investment gains, net of tax				193		193
Change in noncontrolling interest put option			(176)			(176)
Stock-based compensation		16,600				16,600
Cash dividends			(11,414)			(11,414)
Net activity from stock-based compensation awards	16	27,901			(3,199)	24,718
Tax cost from exercise of stock-based compensation awards		(764)				(764)
Proceeds from stock issued under Colleague Stock Purchase Plan			(364)		1,229	865
Repurchase of common shares for treasury					(48,508)	(48,508)
Ending Balance at Jun. 30, 2017	781	415,912	1,881,397	(59,119)	(569,932)	1,669,039
Cumulative effect adjustment upon the adoption | Accounting Standards Update 2016-09 [Member]		(596)	360			(236)
Net income			33,769			33,769
Foreign currency translation				(83,174)		(83,174)
Unrealized investment gains, net of tax				125		125
Change in noncontrolling interest put option			1,872			1,872
Stock-based compensation		14,499				14,499
Net activity from stock-based compensation awards	12	24,762			(5,157)	19,617
Proceeds from stock issued under Colleague Stock Purchase Plan		76	(25)		752	803
Repurchase of common shares for treasury					(137,028)	(137,028)
Ending Balance at Jun. 30, 2018	793	454,653	1,917,373	(142,168)	(711,365)	1,519,286
Cumulative effect adjustment upon the adoption | Accounting Standards Update 2016-01 [Member]			381	(381)		400
Net income			95,168			95,168
Foreign currency translation				5,185		5,185
Unrealized investment gains, net of tax				74		74
Change in noncontrolling interest put option			(20)			(20)
Stock-based compensation		14,075				14,075
Net activity from stock-based compensation awards	8	17,245			(7,060)	10,193
Proceeds from stock issued under Colleague Stock Purchase Plan		88			333	421
Repurchase of common shares for treasury					(252,852)	(252,852)
Ending Balance at Jun. 30, 2019	$ 801	$ 486,061	$ 2,012,902	$ (137,290)	$ (970,944)	$ 1,391,530