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Document and Entity Information
9 Months Ended
Jan. 01, 2012
Jan. 27, 2012
Document and Entity Information [Abstract]    
Entity Registrant Name QLOGIC CORP  
Entity Central Index Key 0000918386  
Document Type 10-Q  
Document Period End Date Jan. 01, 2012  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --04-01  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   98,669,000