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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
12 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Accounting Policies [Abstract]    
Number of customers that accounted for 10% or more of accounts receivable 4qlgc_NumberOfCustomersThatIndividuallyAccountedForTenPercentOrMoreOfCompanysAccountsReceivable 4qlgc_NumberOfCustomersThatIndividuallyAccountedForTenPercentOrMoreOfCompanysAccountsReceivable
Goodwill impairment $ 0us-gaap_GoodwillImpairmentLoss  
IPR&D impairment $ 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill  
Maximum period for company product warranty 5 years