Financial Information of Company's Operation by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues	$ 185,833	$ 150,020
Operating income	19,396	13,471
Interest expense	(1,204)	(483)
Other income (expense), net	(1,682)	(53)
Income taxes	(4,208)	(3,243)
Earnings from Discontinued Operation, net of income tax		2
Net earnings	12,302	9,694
Depreciation and amortization	13,561	11,836
Segment assets	1,062,085		1,071,926
Expenditures for property, plant and equipment	21,530	6,573
Investment	11,857		11,600
Goodwill	196,023		196,145
Eliminations
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Inter-segment revenues	(10,112)	(4,352)
II-VI Laser Solutions | Operating Segments
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues	72,824	55,864
Inter-segment revenues	5,064	464
Operating income	12,923	8,917
Depreciation and amortization	3,533	2,710
Segment assets	326,214
Expenditures for property, plant and equipment	16,066	2,036
Goodwill	43,919		44,041
II-VI Photonics | Operating Segments
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues	63,613	42,017
Inter-segment revenues	2,820	708
Operating income	2,072	771
Depreciation and amortization	5,522	4,580
Segment assets	452,056
Expenditures for property, plant and equipment	2,893	2,511
Goodwill	99,214		99,214
II- VI Performance Products | Operating Segments
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues	49,396	52,139
Inter-segment revenues	2,228	3,180
Operating income	4,401	3,783
Depreciation and amortization	4,506	4,546
Segment assets	283,815
Expenditures for property, plant and equipment	2,571	2,026
Investment	11,857
Goodwill	$ 52,890		$ 52,890