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Summary of Significant Accounting Policies (Warranty) (Details) | 12 Months Ended
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Sep. 30, 2020
Accounting Policies [Abstract] |
Warranty period products, minimum | 1 year
Warranty period products, maximum | 5 years
Warranty period software, maximum | 1 year

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- Definition Standard Product Warranty Accrual, Term, Maximum + References No definition available. + Details
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- Definition Standard Product Warranty Accrual, Term, Minimum + References No definition available. + Details
Name: | dgii_StandardProductWarrantyAccrualTermMinimum
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Standard Software Warranty Accrual Term Maximum + References No definition available. + Details
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Namespace Prefix: | dgii_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration