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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   $ 1,142syna_BusinessCombinationProFormaInformationCostOfAcquiredBuyerTransactionCosts $ 4,300syna_BusinessCombinationProFormaInformationCostOfAcquiredBuyerTransactionCosts $ 1,160syna_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 3,080syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment (13,116)syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment 15,994syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment (65,048)syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment
Income tax adjustment (1,109)syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment 4,722syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment (5,758)syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment 23,417syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment
Total $ 1,971syna_BusinessCombinationProFormaInformationAdjustment $ (8,724)syna_BusinessCombinationProFormaInformationAdjustment $ 13,075syna_BusinessCombinationProFormaInformationAdjustment $ (44,921)syna_BusinessCombinationProFormaInformationAdjustment