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Document And Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2022
Dec. 06, 2022
Mar. 31, 2022
Document and Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2022    
Document Transition Report false    
Entity File Number 000-10843    
Entity Registrant Name CSP Inc.    
Entity Incorporation, State or Country Code MA    
Entity Tax Identification Number 04-2441294    
Entity Address, Address Line One 175 Cabot Street    
Entity Address, City or Town Lowell    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 01854    
City Area Code 978    
Local Phone Number 954-5038    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol CSPI    
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 Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 27,097,563
Entity Common Stock, Shares Outstanding   4,554,788  
Auditor Name RSM US LLP    
Auditor Firm ID 49    
Auditor Location Miami, Florida    
Entity Central Index Key 0000356037    
Current Fiscal Year End Date --09-30    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Amendment Flag false