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Components of Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Line Of Credit Facility [Line Items]    
Total debt $ 188,002us-gaap_LongTermDebt $ 241,960us-gaap_LongTermDebt
Current portion of long-term debt (20,000)us-gaap_LongTermDebtCurrent (20,000)us-gaap_LongTermDebtCurrent
Long-term debt, less current portion 168,002us-gaap_LongTermDebtNoncurrent 221,960us-gaap_LongTermDebtNoncurrent
Line of credit    
Line Of Credit Facility [Line Items]    
Total debt 115,500us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
154,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
Term Loans    
Line Of Credit Facility [Line Items]    
Total debt 70,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= iivi_TermLoansMember
85,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= iivi_TermLoansMember
Yen denominated line of credit    
Line Of Credit Facility [Line Items]    
Total debt $ 2,502us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= iivi_YenRevolvingCreditFacilityMember
$ 2,960us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= iivi_YenRevolvingCreditFacilityMember