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v2.4.1.9

Basis of Presentation of Unaudited Interim Condensed Consolidated Financial Statements and Significant Accounting Policies - (Details) (Adoption of New Accounting Guidance, Restatement Adjustment, USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2014
Adoption of New Accounting Guidance | Restatement Adjustment |
Reclassification of unrecognized tax benefits | $ (0.4)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = dgii_AdoptionofNewAccountingGuidanceMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Increase (Decrease) in noncurrent deferred income taxes receivable | $ (0.4)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = dgii_AdoptionofNewAccountingGuidanceMember / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember

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- Definition The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The net amount of all increases and decreases in unrecognized tax benefits for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration