Document And Entity Information - shares	3 Months Ended
	Apr. 30, 2017	May 31, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	WAL MART STORES INC
Entity Central Index Key	0000104169
Current Fiscal Year End Date	--01-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Apr. 30, 2017
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		3,014,499,132
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes