| Cover | Nov. 17, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 17, 2020 |
| Entity File Number | 1-10596 |
| Entity Registrant Name | ESCO TECHNOLOGIES INC. |
| Entity Central Index Key | 0000866706 |
| Entity Tax Identification Number | 43-1554045 |
| Entity Incorporation, State or Country Code | MO |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | ESE |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
