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Components of Debt (Parenthetical) (Detail) (London Interbank Offered Rate (LIBOR))
 9 Months Ended 12 Months Ended
Mar. 31, 2015
Jun. 30, 2014
Line of credit
    
Line Of Credit Facility [Line Items]    
Debt instrument, rate added on variable rate 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Term Loans
    
Line Of Credit Facility [Line Items]    
Debt instrument, rate added on variable rate 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= iivi_TermLoansMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		  
Yen denominated line of credit
    
Line Of Credit Facility [Line Items]    
Debt instrument, rate added on variable rate 0.625%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= iivi_YenRevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember