Document And Entity Information - shares	6 Months Ended
	Mar. 31, 2022	Apr. 30, 2022
Document And Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	1-10596
Entity Registrant Name	ESCO TECHNOLOGIES INC.
Entity Incorporation, State or Country Code	MO
Entity Tax Identification Number	43-1554045
Entity Address, Address Line One	9900A CLAYTON ROAD
Entity Address, City or Town	ST. LOUIS
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63124-1186
City Area Code	314
Local Phone Number	213-7200
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	ESE
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		25,850,916
Entity Central Index Key	0000866706
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Amendment Flag	false