| Cover | Mar. 02, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 2, 2021 |
| Entity File Number | 1-34033 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | DGII |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
