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Business Acquisitions and License Agreement - Summary of Final Purchase Price Allocation (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2015
Mar. 30, 2014
Mar. 31, 2013
Business Acquisition [Line Items]      
Goodwill $ 167,232us-gaap_Goodwill $ 167,232us-gaap_Goodwill $ 110,976us-gaap_Goodwill
Broadcom 10/40/100Gb Ethernet Business [Member]      
Business Acquisition [Line Items]      
Inventories   2,880us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= qlgc_BroadcomCorporationMember
 
Other current assets   307us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= qlgc_BroadcomCorporationMember
 
Property and equipment   4,070us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= qlgc_BroadcomCorporationMember
 
Goodwill   56,256us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= qlgc_BroadcomCorporationMember
 
Identifiable intangible assets   85,360us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= qlgc_BroadcomCorporationMember
 
Accrued compensation   (987)qlgc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedCompensation
/ us-gaap_BusinessAcquisitionAxis
= qlgc_BroadcomCorporationMember
 
Other current liabilities   (129)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= qlgc_BroadcomCorporationMember
 
Total purchase price   $ 147,757us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= qlgc_BroadcomCorporationMember