Document and Entity Information Document - shares	3 Months Ended
	Dec. 31, 2018	Jan. 31, 2019
Entity Information [Line Items]
Entity Registrant Name	EMERSON ELECTRIC CO
Entity Central Index Key	0000032604
Current Fiscal Year End Date	--09-30
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		614,619,859