Consolidated Statement of Shareholders Equity Statement - USD ($) $ in Thousands	Total	Ordinary Shares	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 2,546			$ 546	$ 2,000
Beginning balance, Shares at Jun. 30, 2015		(44,080,000)	(10,878,000)
Beginning balance, Value at Jun. 30, 2015	248,907	$ 615	$ (412,132)	324,281	435,052	$ (98,909)
Issuance of ordinary shares due to share option exercises, Shares			120,000
Issuance of ordinary shares due to share option exercises, Value	(4,706)		$ (5,199)	(493)
Stock Issued During Period, Value, Acquisitions	8,810		$ 4,900	3,910
Stock Issued During Period, Shares, Acquisitions			112,000
Cancellation of treasury shares, Shares			180,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(7,469)		$ 3,857	(11,326)
Stock Issued During Period, Value, Restricted Stock Award, Gross	0		$ (3,094)	(3,094)
Stock Issued During Period, Shares, Restricted Stock Award, Gross			(82,000)
Share-based compensation expense	21,368			21,368
Treasury Stock, Value, Acquired, Cost Method	(153,467)		$ (153,467)
Treasury Stock, Shares, Acquired			(2,160,000)
Accretion to Redemption Value	(4,919)				4,919
Net Income (Loss) Attributable to Parent	54,349				54,349
Net unrealized loss on derivative instruments designated and qualifying as cash flow hedges	(917)					(917)
Marketable Securities, Unrealized Gain (Loss)	517					517
Foreign currency translation, net of hedges	(9,267)					(9,267)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	561					561
Ending balance, Shares at Jun. 30, 2016		(44,080,000)	(12,544,000)
Ending balance, Value at Jun. 30, 2016	165,725	$ 615	$ (548,549)	335,192	486,482	(108,015)
Issuance of ordinary shares due to share option exercises, Shares			319,000
Issuance of ordinary shares due to share option exercises, Value	(3,494)		$ (6,949)	(3,455)
Cancellation of treasury shares, Shares			154,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(7,333)		$ 3,243	(10,576)
Share-based compensation expense	43,504			43,504
Treasury Stock, Value, Acquired, Cost Method	(50,008)		$ (50,008)
Treasury Stock, Shares, Acquired			(594,000)
Accretion to Redemption Value	(68)			(68)
Reclassification of mandatorily redeemable noncontrolling interest	(3,357)			(3,357)
Net Income (Loss) Attributable to Parent	(71,711)
Net unrealized loss on derivative instruments designated and qualifying as cash flow hedges	72					72
Marketable Securities, Unrealized Gain (Loss)	(5,756)					(5,756)
Marketable Securities, Gain (Loss)	2,268					2,268
Foreign currency translation, net of hedges	(4,161)					(4,161)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	2,194					2,194
Ending balance, Shares at Jun. 30, 2017		(44,080,000)	(12,665,000)
Ending balance, Value at Jun. 30, 2017	74,999	$ 615	$ (588,365)	361,376	414,771	(113,398)
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (5,864)				(5,864)
Issuance of ordinary shares due to share option exercises, Shares	485,323		293,000
Issuance of ordinary shares due to share option exercises, Value	$ (8,173)		$ (3,174)	(4,999)
Cancellation of treasury shares, Shares			63,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(3,944)		$ 840	(4,784)
Stock Issued During Period, Value, Restricted Stock Award, Gross	(168)		$ (168)
Stock Issued During Period, Shares, Restricted Stock Award, Gross			(2,000)
Share-based compensation expense	44,089			44,089
Treasury Stock, Value, Acquired, Cost Method	(94,710)		$ (94,710)
Treasury Stock, Shares, Acquired			(895,000)
Net Income (Loss) Attributable to Parent	43,733
Net unrealized loss on derivative instruments designated and qualifying as cash flow hedges	10,561					10,561
Foreign currency translation, net of hedges	32,782					32,782
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	357					357
Ending balance, Shares at Jun. 30, 2018		(44,080,000)	(13,206,000)
Ending balance, Value at Jun. 30, 2018	$ 93,662	$ 615	$ (685,577)	$ 395,682	$ 452,756	$ (69,814)