Stock-Based Compensation - Summary of Activity of Restricted Stock Units (Detail) (Restricted stock units (RSUs) [Member], Vesting Feature Service Conditions And Either Performance Or Market Condition [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Mar. 29, 2015	Mar. 30, 2014	Mar. 31, 2013
Restricted stock units (RSUs) [Member] \| Vesting Feature Service Conditions And Either Performance Or Market Condition [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit outstanding and unvested, beginning balance, Number of RSUs	423	289	155
Restricted stock unit granted, Number of RSUs	721	374	179
Restricted stock unit vested, Number of RSUs	(24)	(60)	(36)
Restricted stock unit forfeited, Number of RSUs	(141)	(180)	(9)
Restricted stock unit outstanding and unvested, ending balance, Number of RSUs	979	423	289
Restricted stock unit outstanding and unvested, beginning balance, Weighted-Average Grant Date Fair Value	$ 12.02	$ 14.01	$ 13.85
Restricted stock unit granted, Weighted-Average Grant Date Fair Value	$ 12.04	$ 11.67	$ 14.10
Restricted stock unit vested, Weighted-Average Grant Date Fair Value	$ 13.98	$ 13.97	$ 13.85
Restricted stock unit forfeited, Weighted-Average Grant Date Fair Value	$ 10.03	$ 13.86	$ 13.85
Restricted stock unit outstanding and unvested, ending balance, Weighted-Average Grant Date Fair Value	$ 12.27	$ 12.02	$ 14.01
Restricted stock unit vested, Aggregate Fair Value	$ 242	$ 558	$ 508

Stock-Based Compensation - Summary of Activity of Restricted Stock Units (Detail) (Restricted stock units (RSUs) [Member], Vesting Feature Service Conditions And Either Performance Or Market Condition [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified

12 Months Ended

Mar. 29, 2015

Mar. 30, 2014

Mar. 31, 2013

Restricted stock units (RSUs) [Member] | Vesting Feature Service Conditions And Either Performance Or Market Condition [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted stock unit outstanding and unvested, beginning balance, Number of RSUs

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374us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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179us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
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(36)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
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/ us-gaap_VestingAxis
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Restricted stock unit forfeited, Number of RSUs

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(180)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
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(9)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
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Restricted stock unit outstanding and unvested, ending balance, Number of RSUs

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Restricted stock unit outstanding and unvested, beginning balance, Weighted-Average Grant Date Fair Value

$ 12.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
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$ 14.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
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$ 13.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
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= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= qlgc_VestingFeatureServiceConditionsAndEitherPerformanceOrMarketConditionMember

Restricted stock unit granted, Weighted-Average Grant Date Fair Value

$ 12.04us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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$ 11.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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$ 14.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
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Restricted stock unit vested, Weighted-Average Grant Date Fair Value

$ 13.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
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$ 13.97us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
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$ 13.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
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/ us-gaap_VestingAxis
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Restricted stock unit forfeited, Weighted-Average Grant Date Fair Value

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$ 13.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_VestingAxis
= qlgc_VestingFeatureServiceConditionsAndEitherPerformanceOrMarketConditionMember

$ 13.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
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Restricted stock unit outstanding and unvested, ending balance, Weighted-Average Grant Date Fair Value

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Restricted stock unit vested, Aggregate Fair Value

$ 242us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
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$ 558us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
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/ us-gaap_VestingAxis
= qlgc_VestingFeatureServiceConditionsAndEitherPerformanceOrMarketConditionMember

$ 508us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
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/ us-gaap_VestingAxis
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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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