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Contingencies Patent infringement (Details) | 3 Months Ended
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Dec. 31, 2015
Patent Infringement |
Loss Contingencies [Line Items] |
Number of patents allegedly infringed | 4

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of another entity's patents that the entity has allegedly infringed. + References No definition available. + Details
Name: | us-gaap_LossContingencyPatentsAllegedlyInfringedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LitigationCaseAxis=dgii_PatentInfringementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |