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Financial Information of Company's Operation by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues	$ 261,503	$ 221,520
Operating income	29,777	23,691
Interest expense	(3,645)	(1,246)
Other income (expense), net	767	1,402
Income taxes	(5,758)	(7,553)
Net earnings	21,141	16,294
Depreciation and amortization	18,816	14,882
Segment assets	1,583,805		$ 1,477,297
Expenditures for property, plant & equipment	37,426	29,994
Investment	11,998		$ 11,727
Eliminations
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Inter-segment revenues	(12,589)	(11,111)
II-VI Laser Solutions | Operating Segments
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues	93,262	79,290
Inter-segment revenues	7,184	5,940
Operating income	3,265	6,698
Depreciation and amortization	8,306	5,650
Segment assets	704,405
Expenditures for property, plant & equipment	13,256	20,125
II-VI Photonics | Operating Segments
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues	110,614	95,819
Inter-segment revenues	4,578	3,438
Operating income	19,499	13,890
Depreciation and amortization	6,163	4,848
Segment assets	566,198
Expenditures for property, plant & equipment	10,578	6,597
II- VI Performance Products | Operating Segments
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues	57,627	46,411
Inter-segment revenues	827	1,733
Operating income	7,014	3,103
Depreciation and amortization	4,347	4,384
Segment assets	313,202
Expenditures for property, plant & equipment	13,592	$ 3,272
Investment	$ 11,998

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