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Segment Information Expended for Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Expended of property, equipment, improvements and certain other identifiable intangible assets	$ 453	$ 554
IoT Products & Services
Segment Reporting Information [Line Items]
Expended of property, equipment, improvements and certain other identifiable intangible assets	453	483
IoT Solutions
Segment Reporting Information [Line Items]
Expended of property, equipment, improvements and certain other identifiable intangible assets	$ 0	$ 71

X

- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

+ Details

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Balance Type:	credit
Period Type:	duration

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

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dgii_IoTProductsandServicesMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dgii_IoTSolutionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: