Document and Entity Information (USD $)	6 Months Ended
	Dec. 29, 2013	Jan. 22, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	International Rectifier Corp /DE/
Entity Central Index Key	0000316793
Current Fiscal Year End Date	--06-29
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float	$ 1,803,600,677
Entity Common Stock, Shares Outstanding		71,255,116
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 29, 2013