Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Accumulated Other Comprehensive Income	Retained Earnings	Treasury Stock
Beginning Balance at Jun. 30, 2011	$ 521,273	$ 159,186	$ 13,116	$ 377,264	$ (28,293)
Beginning Balance, shares at Jun. 30, 2011		69,077,000			(6,394,000)
Shares issued under stock incentive plans	2,738	2,738
Shares issued under stock incentive plans (in shares)		550,000
Net earnings attributable to II-VI Incorporated	60,306			60,306
Purchases of treasury stock	(4,988)				(4,988)
Purchases of treasury stock, shares	(301,716)				(302,000)
Treasury stock in deferred compensation plan		1,966			(1,966)
Treasury stock in deferred compensation plan, (in shares)					(98,000)
Foreign currency translation adjustment	(2,878)		(2,878)
Share-based compensation expense	11,584	11,584
Excess tax benefits from share-based compensation expense	821	821
Adjustment to redeemable noncontrolling interest	(2,630)			(2,630)
Ending Balance at Jun. 30, 2012	586,226	176,295	10,238	434,940	(35,247)
Ending Balance, shares at Jun. 30, 2012		69,627,000			(6,794,000)
Shares issued under stock incentive plans	4,104	4,104
Shares issued under stock incentive plans (in shares)		596,000
Net earnings attributable to II-VI Incorporated	50,813			50,813
Purchases of treasury stock	(19,978)				(19,978)
Purchases of treasury stock, shares	(1,141,022)				(1,141,000)
Treasury stock in deferred compensation plan		1,291			(1,291)
Treasury stock in deferred compensation plan, (in shares)					(70,000)
Foreign currency translation adjustment	5,362		5,362
Share-based compensation expense	11,959	11,959
Excess tax benefits from share-based compensation expense	635	635
Adjustment to redeemable noncontrolling interest	(2,875)			(2,875)
Minimum tax withholding requirements	(138)				(138)
Minimum tax withholding requirements, (in shares)					(7,000)
Ending Balance at Jun. 30, 2013	636,108	194,284	15,600	482,878	(56,654)
Ending Balance, shares at Jun. 30, 2013		70,223,000			(8,012,000)
Shares issued under stock incentive plans	3,655	4,482			(827)
Shares issued under stock incentive plans (in shares)		712,000			(44,000)
Net earnings attributable to II-VI Incorporated	38,449			38,449
Purchases of treasury stock	(19,973)				(19,973)
Purchases of treasury stock, shares	(1,333,355)				(1,333,000)
Treasury stock in deferred compensation plan		1,809			(1,809)
Treasury stock in deferred compensation plan, (in shares)					(93,000)
Foreign currency translation adjustment	2,363		2,363
Share-based compensation expense	12,347	12,347
Pension other comprehensive income	1,443		1,443
Excess tax benefits from share-based compensation expense	651	651
Adjustment to redeemable noncontrolling interest
Ending Balance at Jun. 30, 2014	$ 675,043	$ 213,573	$ 19,406	$ 521,327	$ (79,263)
Ending Balance, shares at Jun. 30, 2014		70,935,000			(9,482,000)