v3.19.1
Document and Entity Information - shares
6 Months Ended
Mar. 31, 2019
Apr. 30, 2019
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Registrant Name ESCO TECHNOLOGIES INC  
Entity Central Index Key 0000866706  
Current Fiscal Year End Date --09-30  
Entity Filer Category Large Accelerated Filer  
Trading Symbol ESE  
Entity Common Stock, Shares Outstanding   25,977,687
Entity Emerging Growth Company false  
Entity Small Business false