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Special Charges - Summary of Special Charges (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Restructuring and Related Activities [Abstract]
Exit costs	$ 69us-gaap_RestructuringCharges	$ 1,947us-gaap_RestructuringCharges	$ 3,361us-gaap_RestructuringCharges	$ 15,900us-gaap_RestructuringCharges
Asset impairments			1,011	2,429
Other charges			500us-gaap_OtherExpenses
Special charges	$ 69qlgc_SpecialCharges	$ 1,947qlgc_SpecialCharges	$ 4,872qlgc_SpecialCharges	$ 18,329qlgc_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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