Financial Information of Company's Operation by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues	$ 176,736us-gaap_Revenues	$ 171,765us-gaap_Revenues	$ 362,569us-gaap_Revenues	$ 321,785us-gaap_Revenues
Operating income	16,531us-gaap_OperatingIncomeLoss	9,568us-gaap_OperatingIncomeLoss	35,927us-gaap_OperatingIncomeLoss	23,039us-gaap_OperatingIncomeLoss
Interest expense	(1,038)us-gaap_InterestExpense	(1,169)us-gaap_InterestExpense	(2,242)us-gaap_InterestExpense	(1,652)us-gaap_InterestExpense
Other income (expense), net	9,295us-gaap_OtherOperatingIncomeExpenseNet	1,125us-gaap_OtherOperatingIncomeExpenseNet	7,613us-gaap_OtherOperatingIncomeExpenseNet	1,072us-gaap_OtherOperatingIncomeExpenseNet
Income taxes	(2,692)us-gaap_IncomeTaxExpenseBenefit	(2,086)us-gaap_IncomeTaxExpenseBenefit	(6,900)us-gaap_IncomeTaxExpenseBenefit	(5,329)us-gaap_IncomeTaxExpenseBenefit
Earnings from discontinued operation		131		133
Net earnings	22,096us-gaap_NetIncomeLoss	7,569us-gaap_NetIncomeLoss	34,398us-gaap_NetIncomeLoss	17,263us-gaap_NetIncomeLoss
Depreciation and amortization	13,071us-gaap_DepreciationAndAmortization	14,397us-gaap_DepreciationAndAmortization	26,632us-gaap_DepreciationAndAmortization	26,233us-gaap_DepreciationAndAmortization
Segment assets	1,046,117us-gaap_Assets		1,046,117us-gaap_Assets		1,071,926us-gaap_Assets
Expenditures for property, plant and equipment	10,079	7,716	31,609	14,289
Investment	12,113us-gaap_EquityMethodInvestments		12,113us-gaap_EquityMethodInvestments		11,589us-gaap_EquityMethodInvestments
Goodwill	196,096us-gaap_Goodwill		196,096us-gaap_Goodwill		196,145us-gaap_Goodwill
Eliminations
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Inter-segment revenues	(11,178)	(6,470)	(21,290)	(10,822)
II-VI Laser Solutions
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Goodwill	43,809		43,809		44,041
II-VI Laser Solutions \| Operating Segments
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues	67,655	63,695	140,454	119,559
Inter-segment revenues	5,498	1,736	10,562	2,200
Operating income	12,226	3,444	25,149	12,361
Depreciation and amortization	3,368	4,754	6,901	7,464
Segment assets	325,561		325,561
Expenditures for property, plant and equipment	3,372	3,449	19,438	5,485
Goodwill	43,809		43,809
II-VI Photonics
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Goodwill	99,397		99,397		99,214
II-VI Photonics \| Operating Segments
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues	60,853	54,921	124,491	96,938
Inter-segment revenues	3,800	2,115	6,620	2,823
Operating income	413	(197)	2,485	574
Depreciation and amortization	5,229	5,071	10,751	9,651
Segment assets	443,540		443,540
Expenditures for property, plant and equipment	3,076	2,939	5,969	5,450
Goodwill	99,397		99,397
II- VI Performance Products
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Goodwill	52,890		52,890		52,890
II- VI Performance Products \| Operating Segments
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items]
Revenues	48,228	53,149	97,624	105,288
Inter-segment revenues	1,880	2,619	4,108	5,799
Operating income	3,892	6,321	8,293	10,104
Depreciation and amortization	4,474	4,572	8,980	9,118
Segment assets	277,016		277,016
Expenditures for property, plant and equipment	3,631	1,328	6,202	3,354
Investment	12,113		12,113
Goodwill	$ 52,890		$ 52,890

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