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Acquisitions - Pro Forma Adjustments Used to Arrive at Pro Forma Net Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014
Business Combinations [Abstract] |  |  |  |
Buyer transaction costs |  | $ 1,142 syna_BusinessCombinationProFormaInformationCostOfAcquiredBuyerTransactionCosts | $ 4,300 syna_BusinessCombinationProFormaInformationCostOfAcquiredBuyerTransactionCosts | $ 1,160 syna_BusinessCombinationProFormaInformationCostOfAcquiredBuyerTransactionCosts
Amortization of debt issuance costs |  | (250)syna_BusinessCombinationProFormaInformationAmortizationOfDebtIssuanceCostsAdjustments | (250)syna_BusinessCombinationProFormaInformationAmortizationOfDebtIssuanceCostsAdjustments | (750)syna_BusinessCombinationProFormaInformationAmortizationOfDebtIssuanceCostsAdjustments
Interest expense |  | (1,222)syna_BusinessCombinationProFormaInformationInterestExpenseAdjustments | (1,211)syna_BusinessCombinationProFormaInformationInterestExpenseAdjustments | (3,700)syna_BusinessCombinationProFormaInformationInterestExpenseAdjustments
Intangible amortization | 3,080 syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment | (13,116)syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment | 15,994 syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment | (65,048)syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment
Income tax adjustment | (1,109)syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment | 4,722 syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment | (5,758)syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment | 23,417 syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment
Total | $ 1,971 syna_BusinessCombinationProFormaInformationAdjustment | $ (8,724)syna_BusinessCombinationProFormaInformationAdjustment | $ 13,075 syna_BusinessCombinationProFormaInformationAdjustment | $ (44,921)syna_BusinessCombinationProFormaInformationAdjustment

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