Cover Page - USD ($)	12 Months Ended
	Sep. 30, 2022	Nov. 17, 2022	Mar. 31, 2022
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2022
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	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
Entity Shell Company	false
Entity Public Float			$ 734,732,375
Entity Common Stock, Shares Outstanding		35,556,333
Entity Central Index Key	0000854775
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false
Auditor Location	Cincinnati, Ohio
Auditor Name	GRANT THORNTON LLP
Auditor Firm ID	248
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