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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 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Business Combinations [Abstract]        
Buyer transaction costs $ 3,000syna_BusinessCombinationProFormaInformationCostOfAcquiredBuyerTransactionCosts $ 18syna_BusinessCombinationProFormaInformationCostOfAcquiredBuyerTransactionCosts $ 4,300syna_BusinessCombinationProFormaInformationCostOfAcquiredBuyerTransactionCosts $ 18syna_BusinessCombinationProFormaInformationCostOfAcquiredBuyerTransactionCosts
Amortization of debt issuance costs   (250)syna_BusinessCombinationProFormaInformationAmortizationOfDebtIssuanceCostsAdjustments (250)syna_BusinessCombinationProFormaInformationAmortizationOfDebtIssuanceCostsAdjustments (500)syna_BusinessCombinationProFormaInformationAmortizationOfDebtIssuanceCostsAdjustments
Interest expense   (1,561)syna_BusinessCombinationProFormaInformationInterestExpenseAdjustments (2,852)syna_BusinessCombinationProFormaInformationInterestExpenseAdjustments (2,828)syna_BusinessCombinationProFormaInformationInterestExpenseAdjustments
Intangible amortization 26,000syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment (19,319)syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment 13,131syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment (58,188)syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment
Income tax adjustment (9,360)syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment 6,955syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment (4,727)syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment 20,948syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment
Total $ 19,640syna_BusinessCombinationProFormaInformationAdjustment $ (14,157)syna_BusinessCombinationProFormaInformationAdjustment $ 9,602syna_BusinessCombinationProFormaInformationAdjustment $ (40,550)syna_BusinessCombinationProFormaInformationAdjustment