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Contingencies Patent infringement (Details)	3 Months Ended
	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

X

- 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

X

- Details

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