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v3.20.2

Summary of Significant Accounting Policies (Revenue Recognition) (Details) - Subscription and Circulation | 12 Months Ended
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Sep. 30, 2020
Minimum |
Customer With Contract, Length Of Contract | 1 year
Maximum |
Customer With Contract, Length Of Contract | 5 years

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- Definition Customer With Contract, Length Of Contract + 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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- Details
Name: | srt_ProductOrServiceAxis=us-gaap_SubscriptionAndCirculationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |