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Marketable Securities - Schedule of Amortized Cost and Estimated Fair Value of Debt Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 28, 2014
Mar. 30, 2014
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, Amortized Cost $ 18,047us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis  
Due after one year through three years, Amortized Cost 144,154qlgc_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughThreeAmortizedCostBasis  
Due after three years through five years, Amortized Cost 11,586qlgc_AvailableForSaleSecuritiesDebtMaturitiesRollingYearFourThroughFiveAmortizedCostBasis  
Due after five years, Amortized Cost 18,820qlgc_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearFiveAmortizedCostBasis  
Available-for-sale securities, Amortized Cost 192,607us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 186,568us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Due in one year or less, Estimated Fair Value 18,054us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue  
Due after one year through three years, Estimated Fair Value 143,896qlgc_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughThreeFairValue  
Due after three years through five years, Estimated Fair Value 11,569qlgc_AvailableForSaleSecuritiesDebtMaturitiesRollingYearFourThroughFiveFairValue  
Due after five years, Estimated Fair Value 18,905qlgc_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearFiveFairValue  
Total estimated fair value of debt securities $ 192,424us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent $ 186,783us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent