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Revolving Credit Facility - Additional Information (Detail) (Unsecured Debt [Member], Revolving Credit Facility [Member], USD $)
12 Months Ended
Mar. 29, 2015
Mar. 31, 2013
Line of Credit Facility [Line Items]    
Unsecured revolving credit facility   $ 125,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Credit facility maturities date Mar. 31, 2018  
Available increase in revolving commitments   100,000,000qlgc_AdditionalBorrowingsAvailableUnderLineOfCreditFacility
Borrowings outstanding $ 0us-gaap_LineOfCredit  
Minimum [Member]
   
Line of Credit Facility [Line Items]    
Unused commitment fee percentage 0.20%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Minimum [Member] | Base Rate [Member]
   
Line of Credit Facility [Line Items]    
Basis spread on variable rate 0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
 
Minimum [Member] | LIBO Rate [Member]
   
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
Maximum [Member]
   
Line of Credit Facility [Line Items]    
Unused commitment fee percentage 0.35%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Maximum [Member] | Base Rate [Member]
   
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
 
Maximum [Member] | LIBO Rate [Member]
   
Line of Credit Facility [Line Items]    
Basis spread on variable rate 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember