Document and Entity Information	3 Months Ended
	Nov. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	WALGREEN CO
Entity Central Index Key	0000104207
Current Fiscal Year End Date	--08-31
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	945,642,298
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Nov. 30, 2014