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Cover - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Dec. 04, 2023
Mar. 31, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2023    
Current Fiscal Year End Date --09-30    
Document Transition Report false    
Entity File Number 001-12488    
Entity Registrant Name Powell Industries, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 88-0106100    
Entity Address, Address Line One 8550 Mosley Road    
Entity Address, City or Town Houston    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77075-1180    
City Area Code 713    
Local Phone Number 944-6900    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol POWL    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 324
Entity Common Stock, Shares Outstanding   11,959,333  
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement for the 2023 annual meeting of stockholders to be filed not later than 120 days after September 30, 2023, are incorporated by reference into Part III of this Form 10-K.
    
Entity Central Index Key 0000080420    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY