Cover - shares	6 Months Ended
	Mar. 31, 2022	May 01, 2022
Cover [Abstract]
Document Type	10-Q/A
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2022
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2022
Current Fiscal Year End Date	--09-30
Entity File Number	001-34033
Entity Registrant Name	DIGI INTERNATIONAL INC.
Entity Central Index Key	0000854775
Entity Tax Identification Number	41-1532464
Entity Incorporation, State or Country Code	DE
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
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	DGII
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		35,084,758