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Document and Entity Information (USD $)
12 Months Ended
Jun. 30, 2013
Aug. 12, 2013
Dec. 23, 2012
Document and Entity Information [Abstract]      
Entity Registrant Name International Rectifier Corp /DE/    
Entity Central Index Key 0000316793    
Current Fiscal Year End Date --06-30    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 1,228,885,481
Entity Common Stock, Shares Outstanding   70,784,753  
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 30, 2013