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Summary of Significant Accounting Policies (Warranty) (Details) | 12 Months Ended
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Sep. 30, 2015
Accounting Policies [Abstract] |
Warranty period, minimum | 1 year
Warranty period, maximum | 5 years

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

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

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