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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Mar. 31, 2013
Income Statement [Abstract]      
Net revenues $ 520,198us-gaap_SalesRevenueNet $ 460,907us-gaap_SalesRevenueNet $ 484,538us-gaap_SalesRevenueNet
Cost of revenues 214,146us-gaap_CostOfRevenue 150,800us-gaap_CostOfRevenue 159,180us-gaap_CostOfRevenue
Gross profit 306,052us-gaap_GrossProfit 310,107us-gaap_GrossProfit 325,358us-gaap_GrossProfit
Operating expenses:      
Engineering and development 144,260us-gaap_ResearchAndDevelopmentExpense 147,010us-gaap_ResearchAndDevelopmentExpense 156,097us-gaap_ResearchAndDevelopmentExpense
Sales and marketing 64,330us-gaap_SellingAndMarketingExpense 68,367us-gaap_SellingAndMarketingExpense 78,512us-gaap_SellingAndMarketingExpense
General and administrative 32,512us-gaap_GeneralAndAdministrativeExpense 32,097us-gaap_GeneralAndAdministrativeExpense 32,899us-gaap_GeneralAndAdministrativeExpense
Special charges 10,520qlgc_SpecialCharges 74,853qlgc_SpecialCharges  
Total operating expenses 251,622us-gaap_OperatingExpenses 322,327us-gaap_OperatingExpenses 267,508us-gaap_OperatingExpenses
Operating income (loss) 54,430us-gaap_OperatingIncomeLoss (12,220)us-gaap_OperatingIncomeLoss 57,850us-gaap_OperatingIncomeLoss
Interest and other income, net 763us-gaap_OtherNonoperatingIncomeExpense 3,260us-gaap_OtherNonoperatingIncomeExpense 4,007us-gaap_OtherNonoperatingIncomeExpense
Income (loss) from continuing operations before income taxes 55,193us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (8,960)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 61,857us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense (benefit) 4,600us-gaap_IncomeTaxExpenseBenefit 9,306us-gaap_IncomeTaxExpenseBenefit (11,704)us-gaap_IncomeTaxExpenseBenefit
Income (loss) from continuing operations 50,593us-gaap_IncomeLossFromContinuingOperations (18,266)us-gaap_IncomeLossFromContinuingOperations 73,561us-gaap_IncomeLossFromContinuingOperations
Loss from discontinued operations, net of income taxes     (425)qlgc_IncomeLossFromDiscontinuedOperationsExcludingGainLossOnSaleNetOfTax
Net income (loss) $ 50,593us-gaap_NetIncomeLoss $ (18,266)us-gaap_NetIncomeLoss $ 73,136us-gaap_NetIncomeLoss
Income (loss) from continuing operations per share:      
Basic $ 0.58us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.21)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.79us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted $ 0.57us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.21)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.78us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Loss from discontinued operations per share:      
Basic     $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Diluted $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income (loss) per share:      
Basic $ 0.58us-gaap_EarningsPerShareBasic $ (0.21)us-gaap_EarningsPerShareBasic $ 0.78us-gaap_EarningsPerShareBasic
Diluted $ 0.57us-gaap_EarningsPerShareDiluted $ (0.21)us-gaap_EarningsPerShareDiluted $ 0.78us-gaap_EarningsPerShareDiluted
Number of shares used in per share calculations:      
Basic 87,584us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 87,612us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 93,560us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 88,463us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 87,612us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 93,998us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding