Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Sep. 30, 2017	Nov. 15, 2017	Apr. 01, 2017
Document Documentand Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	DIS
Entity Registrant Name	WALT DISNEY CO/
Entity Central Index Key	0001001039
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--09-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		1,510,312,194
Entity Public Float			$ 177.9