Document and Entity Information	9 Months Ended
	Aug. 31, 2014
Entity Information [Line Items]
Entity Registrant Name	IHS Inc.
Entity Central Index Key	0001316360
Current Fiscal Year End Date	--11-30
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Aug. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding	68,172,435