XML 16 R1.htm IDEA: XBRL DOCUMENT v3.25.3
Cover Page - USD ($)
 12 Months Ended
Sep. 30, 2025
Nov. 14, 2025
Mar. 31, 2025
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2025    
Document Transition Report false    
Entity File Number 001-34033    
Entity Registrant Name DIGI INTERNATIONAL INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 41-1532464    
Entity Address, Address Line One 9350 Excelsior Blvd.    
Entity Address, Address Line Two Suite 700    
Entity Address, City or Town Hopkins    
Entity Address, State or Province MN    
Entity Address, Postal Zip Code 55343    
City Area Code 952    
Local Phone Number 912-3444    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 1,010,000,000.00
Entity Common Stock, Shares Outstanding   37,232,593  
Entity Central Index Key 0000854775    
Current Fiscal Year End Date --09-30    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Financial Statement Error Correction [Flag] false    
Auditor Location Minneapolis, Minnesota    
Auditor Name Deloitte & Touche LLP    
Auditor Firm ID 34    
NASDAQ - ALL MARKETS [Member]      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, par value $.01 per share    
Trading Symbol DGII    
Security Exchange Name NASDAQ