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Leases Narrative (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2020 USD ($) ft²
Leases [Abstract] |
Lease agreement term, lease not yet commenced | 10 years
Operating lease payment due, lease not yet commenced | $ 4,800
Tenant improvement allowance, lease not yet commenced | $ 1,000
Area of lease not yet commenced | ft² | 35,466

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- Definition Area of lease not yet commenced + References No definition available. + Details
Name: | dgii_AreaOfLeaseNotYetCommenced
Namespace Prefix: | dgii_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Lessee operating lease, lease not yet commenced, tenant improvements + References No definition available. + Details
Name: | dgii_LesseeOperatingLeaseLeaseNotYetCommencedTenantImprovements
Namespace Prefix: | dgii_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Lessee. Operating Lease. Liability. Payments Due, Lease Not Yet Commenced + References No definition available. + Details
Name: | dgii_LesseeOperatingLeaseLiabilityPaymentsDueLeaseNotYetCommenced
Namespace Prefix: | dgii_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant