CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]
Beginning Balance at Jun. 30, 2017	$ 1,669,039	$ 781	$ 415,912	$ 1,881,397	$ (59,119)	$ (569,932)
Cumulative effect adjustment upon the adoption	(236)		(596)	360
Net income (loss)	(68,371)			(68,371)
Foreign currency translation	(1,699)				(1,699)
Unrealized investment gains (losses), net of tax	73				73
Change in noncontrolling interest put option	(615)			(615)
Stock-based compensation	8,780		8,780
Net activity from stock-based compensation awards	5,775	6	9,754			(3,985)
Proceeds from stock issued under Colleague Stock Purchase Plan	391		5	(25)		411
Repurchase of common shares for treasury	(93,178)					(93,178)
Ending Balance at Dec. 31, 2017	1,519,959	787	433,855	1,812,746	(60,745)	(666,684)
Beginning Balance at Sep. 30, 2017	1,658,039	785	422,358	1,894,372	(35,720)	(623,756)
Net income (loss)	(81,156)			(81,156)
Foreign currency translation	(25,028)				(25,028)
Unrealized investment gains (losses), net of tax	3				3
Change in noncontrolling interest put option	(465)			(465)
Stock-based compensation	3,796		3,796
Net activity from stock-based compensation awards	7,377	2	7,696			(321)
Proceeds from stock issued under Colleague Stock Purchase Plan	196		5	(5)		196
Repurchase of common shares for treasury	(42,803)					(42,803)
Ending Balance at Dec. 31, 2017	1,519,959	787	433,855	1,812,746	(60,745)	(666,684)
Beginning Balance at Jun. 30, 2018	1,519,286	793	454,653	1,917,373	(142,168)	(711,365)
Cumulative effect adjustment upon the adoption	0			381	(381)
Net income (loss)	7,765			7,765
Foreign currency translation	(955)				(955)
Unrealized investment gains (losses), net of tax	(14)				(14)
Change in noncontrolling interest put option	615			615
Stock-based compensation	8,188		8,188
Net activity from stock-based compensation awards	10,383	8	17,035			(6,660)
Proceeds from stock issued under Colleague Stock Purchase Plan	312		70			242
Repurchase of common shares for treasury	(115,933)					(115,933)
Ending Balance at Dec. 31, 2018	1,429,647	801	479,946	1,926,134	(143,518)	(833,716)
Beginning Balance at Sep. 30, 2018	1,440,035	798	469,545	1,908,465	(163,168)	(775,605)
Net income (loss)	17,295			17,295
Foreign currency translation	19,660				19,660
Unrealized investment gains (losses), net of tax	(10)				(10)
Change in noncontrolling interest put option	374			374
Stock-based compensation	3,819		3,819
Net activity from stock-based compensation awards	5,079	3	6,548			(1,472)
Proceeds from stock issued under Colleague Stock Purchase Plan	153		34			119
Repurchase of common shares for treasury	(56,758)					(56,758)
Ending Balance at Dec. 31, 2018	$ 1,429,647	$ 801	$ 479,946	$ 1,926,134	$ (143,518)	$ (833,716)