Document and Entity Information	3 Months Ended
	Apr. 30, 2012	May 31, 2012
Document and Entity Information
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Apr. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Trading Symbol	nav
Entity Registrant Name	NAVISTAR INTERNATIONAL CORP
Entity Central Index Key	0000808450
Current Fiscal Year End Date	--10-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		68,546,949