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Quarterly Financial Data - Additional Information (Details) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2019 USD ($)
Quarterly Financial Information Disclosure [Abstract] |
Net discrete tax expense (benefits) | $ (1.0)

X
- Definition Income Tax Expense (Benefit) Specific to the Period + References No definition available. + Details
Name: | dgii_IncomeTaxExpenseBenefitSpecifictothePeriod
Namespace Prefix: | dgii_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_QuarterlyFinancialInformationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration