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Special Charges - Summary of Special Charges (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended			12 Months Ended
	Mar. 30, 2014	Mar. 29, 2015	Mar. 30, 2014	Jun. 30, 2013	Mar. 29, 2015	Mar. 30, 2014
Restructuring and Related Activities [Abstract]
Exit costs		$ 3,500us-gaap_RestructuringCharges	$ 10,600us-gaap_RestructuringCharges	$ 9,600us-gaap_RestructuringCharges	$ 6,946us-gaap_RestructuringCharges	$ 26,491us-gaap_RestructuringCharges
Asset impairments		2,100	4,900	2,400	3,074	7,322
Other charges					500us-gaap_OtherExpenses
Patent license (Note 2)	41,000qlgc_PatentLicenseAgreementPriorPeriods		41,000qlgc_PatentLicenseAgreementPriorPeriods			41,040qlgc_PatentLicenseAgreementPriorPeriods
Special charges		$ 5,600qlgc_SpecialCharges	$ 56,500qlgc_SpecialCharges	$ 12,000qlgc_SpecialCharges	$ 10,520qlgc_SpecialCharges	$ 74,853qlgc_SpecialCharges

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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