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Special Charges - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Jun. 30, 2013
Mar. 29, 2015
Mar. 30, 2014
Restructuring Cost and Reserve [Line Items]          
Exit costs $ 3,500,000us-gaap_RestructuringCharges $ 10,600,000us-gaap_RestructuringCharges $ 9,600,000us-gaap_RestructuringCharges $ 6,946,000us-gaap_RestructuringCharges $ 26,491,000us-gaap_RestructuringCharges
Unpaid exit costs 3,664,000us-gaap_RestructuringReserveCurrent 10,042,000us-gaap_RestructuringReserveCurrent   3,664,000us-gaap_RestructuringReserveCurrent 10,042,000us-gaap_RestructuringReserveCurrent
Special charges 5,600,000qlgc_SpecialCharges 56,500,000qlgc_SpecialCharges 12,000,000qlgc_SpecialCharges 10,520,000qlgc_SpecialCharges 74,853,000qlgc_SpecialCharges
Asset impairment charges 2,100,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 4,900,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 2,400,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 3,074,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 7,322,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
March 2015 Initiative [Member] | Workforce Reductions [Member]          
Restructuring Cost and Reserve [Line Items]          
Exit costs       1,200,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= qlgc_WorkforceReductionMember
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndFifteenInitiativesMember
 
Unpaid exit costs 1,100,000us-gaap_RestructuringReserveCurrent
/ us-gaap_RestructuringCostAndReserveAxis
= qlgc_WorkforceReductionMember
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndFifteenInitiativesMember
    1,100,000us-gaap_RestructuringReserveCurrent
/ us-gaap_RestructuringCostAndReserveAxis
= qlgc_WorkforceReductionMember
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndFifteenInitiativesMember
 
March 2014 Initiative [Member]          
Restructuring Cost and Reserve [Line Items]          
Exit costs       2,620,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndFourteenInitiativeMember
9,114,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndFourteenInitiativeMember
Date the company commenced the restructuring plan       Mar. 17, 2014  
Special charges       3,600,000qlgc_SpecialCharges
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndFourteenInitiativeMember
14,000,000qlgc_SpecialCharges
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndFourteenInitiativeMember
Asset impairment charges       1,000,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndFourteenInitiativeMember
4,900,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndFourteenInitiativeMember
March 2014 Initiative [Member] | Workforce Reductions [Member]          
Restructuring Cost and Reserve [Line Items]          
Exit costs       2,693,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= qlgc_WorkforceReductionMember
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndFourteenInitiativeMember
4,789,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= qlgc_WorkforceReductionMember
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndFourteenInitiativeMember
June 2013 Initiative [Member]          
Restructuring Cost and Reserve [Line Items]          
Exit costs 2,400,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndThirteenInitiativeMember
    3,102,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndThirteenInitiativeMember
17,377,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndThirteenInitiativeMember
Date the company commenced the restructuring plan       Jun. 03, 2013  
Special charges       5,200,000qlgc_SpecialCharges
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndThirteenInitiativeMember
19,800,000qlgc_SpecialCharges
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndThirteenInitiativeMember
Asset impairment charges       2,100,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndThirteenInitiativeMember
2,400,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndThirteenInitiativeMember
Non-cash adjustment 1,666,000us-gaap_RestructuringReserveAccrualAdjustment
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndThirteenInitiativeMember
    1,666,000us-gaap_RestructuringReserveAccrualAdjustment
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndThirteenInitiativeMember
 
Additional severance costs 1,000,000us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndThirteenInitiativeMember
    1,000,000us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndThirteenInitiativeMember
 
Expected date of completion, restructuring activities       Apr. 01, 2018  
June 2013 Initiative [Member] | Workforce Reductions [Member]          
Restructuring Cost and Reserve [Line Items]          
Exit costs       $ 749,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= qlgc_WorkforceReductionMember
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndThirteenInitiativeMember
$ 13,831,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= qlgc_WorkforceReductionMember
/ us-gaap_RestructuringPlanAxis
= qlgc_TwoThousandAndThirteenInitiativeMember