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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
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Business Combinations [Abstract] |  |  |  |
Buyer transaction costs | $ 3,000 syna_BusinessCombinationProFormaInformationCostOfAcquiredBuyerTransactionCosts | $ 18 syna_BusinessCombinationProFormaInformationCostOfAcquiredBuyerTransactionCosts | $ 4,300 syna_BusinessCombinationProFormaInformationCostOfAcquiredBuyerTransactionCosts | $ 18 syna_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 | 26,000 syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment | (19,319)syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment | 13,131 syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment | (58,188)syna_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsAdjustment
Income tax adjustment | (9,360)syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment | 6,955 syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment | (4,727)syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment | 20,948 syna_BusinessCombinationProFormaInformationIncomeTaxAdjustment
Total | $ 19,640 syna_BusinessCombinationProFormaInformationAdjustment | $ (14,157)syna_BusinessCombinationProFormaInformationAdjustment | $ 9,602 syna_BusinessCombinationProFormaInformationAdjustment | $ (40,550)syna_BusinessCombinationProFormaInformationAdjustment

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- Details
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