Business Combination, Contingent Liability, Payout Period

No definition available.

Name:	dgii_BusinessCombinationContingentLiabilityPayoutPeriod
Namespace Prefix:	dgii_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Business Combination, Contingent Liability, Payout Period Installments

+ References

No definition available.

+ Details

Name:	dgii_BusinessCombinationContingentLiabilityPayoutPeriodInstallments
Namespace Prefix:	dgii_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Payments to Acquire Business Gross before working capital adjustments

+ References

No definition available.

+ Details

Name:	dgii_PaymentstoAcquireBusinessGrossbeforeworkingcapitaladjustments
Namespace Prefix:	dgii_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460

+ Details

Name:	us-gaap_BusinessCombinationAcquisitionRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

+ Details

Name:	us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

+ Details

Name:	us-gaap_CashAcquiredFromAcquisition
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dgii_AcceleratedConceptsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dgii_TempAlertMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dgii_SMARTTempsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dgii_FreshTempMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dgii_BluenicaCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_DevelopedTechnologyRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksAndTradeNamesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_OrderOrProductionBacklogMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ContingentConsiderationByTypeAxis=dgii_EarnOutPaymentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ContingentConsiderationByTypeAxis=dgii_Performance1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=dgii_ContingentConsiderationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Acquisition (Details)						12 Months Ended
Acquisition (Details)	Jan. 22, 2018 USD ($)	Oct. 20, 2017 USD ($)	Jan. 09, 2017 USD ($)	Nov. 01, 2016 USD ($)	Oct. 05, 2015 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)
Business Acquisition [Line Items]
Goodwill						$ 154,535,000	$ 131,995,000				$ 109,448,000
Accelerated Concepts
Business Acquisition [Line Items]
Cash paid at closing	$ 16,430,000
Cash acquired	$ 200,000
Earn-out payment installment period	2
Goodwill	$ 5,664,000
Weighted average useful life of acquired intangibles	5 years 6 months
Acquisition costs						300,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual						22,200,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual						2,800,000
TempAlert
Business Acquisition [Line Items]
Cash paid at closing		$ 40,741,000
Cash acquired		600,000
Goodwill		$ 17,552,000
Weighted average useful life of acquired intangibles		6 years 6 months
Acquisition costs						1,400,000	400,000
Payments to Acquire Business Gross before working capital adjustments		$ 45,000,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual						17,000,000
SMART Temps
Business Acquisition [Line Items]
Cash paid at closing			$ 28,800,000
Cash acquired			500,000
Goodwill			18,800,000
FreshTemp
Business Acquisition [Line Items]
Cash paid at closing				$ 1,700,000
Earn-out payment maximum				2,300,000
Goodwill				2,700,000
Bluenica Corporation
Business Acquisition [Line Items]
Cash paid at closing					$ 2,900,000
Business Combination, Contingent Liability, Payout Period					4 years
Earn-out payment maximum					$ 11,600,000
Goodwill					11,000,000
Purchased and Core Technology \| Accelerated Concepts
Business Acquisition [Line Items]
Estimated useful life of finite lived intangibles	5 years
Purchased and Core Technology \| TempAlert
Business Acquisition [Line Items]
Estimated useful life of finite lived intangibles		5 years
Customer Relationships \| Accelerated Concepts
Business Acquisition [Line Items]
Estimated useful life of finite lived intangibles	7 years
Customer Relationships \| TempAlert
Business Acquisition [Line Items]
Estimated useful life of finite lived intangibles		7 years
Trademarks and Trade Names \| Accelerated Concepts
Business Acquisition [Line Items]
Estimated useful life of finite lived intangibles	5 years
Trademarks and Trade Names \| TempAlert
Business Acquisition [Line Items]
Estimated useful life of finite lived intangibles		5 years
Order backlog \| Accelerated Concepts
Business Acquisition [Line Items]
Estimated useful life of finite lived intangibles	1 year
Earn-out payments \| Accelerated Concepts
Business Acquisition [Line Items]
Earn-out payment maximum	$ 4,500,000
Earn-out payments \| SMART Temps
Business Acquisition [Line Items]
Earn-out payment maximum			7,200,000
Additional earn-out payment \| Accelerated Concepts
Business Acquisition [Line Items]
Earn-out payment maximum	2,000,000
Additional earn-out payment \| Bluenica Corporation
Business Acquisition [Line Items]
Earn-out payment maximum					3,500,000
Fair Value, Measurements, Recurring \| Contingent Consideration \| Estimate of Fair Value Measurement
Business Acquisition [Line Items]
Contingent consideration fair value						10,065,000	$ 6,388,000
Fair Value, Measurements, Recurring \| Contingent Consideration \| Estimate of Fair Value Measurement \| Accelerated Concepts
Business Acquisition [Line Items]
Contingent consideration fair value	$ 2,300,000					4,400,000
Fair Value, Measurements, Recurring \| Contingent Consideration \| Estimate of Fair Value Measurement \| TempAlert
Business Acquisition [Line Items]
Contingent consideration fair value		$ 0				0
Fair Value, Measurements, Recurring \| Contingent Consideration \| Estimate of Fair Value Measurement \| SMART Temps
Business Acquisition [Line Items]
Contingent consideration fair value			$ 10,000							$ 0
Fair Value, Measurements, Recurring \| Contingent Consideration \| Estimate of Fair Value Measurement \| FreshTemp
Business Acquisition [Line Items]
Contingent consideration fair value				$ 1,300,000		200,000
Fair Value, Measurements, Recurring \| Contingent Consideration \| Estimate of Fair Value Measurement \| Bluenica Corporation
Business Acquisition [Line Items]
Contingent consideration fair value					$ 10,400,000	$ 5,500,000
Forecast \| Earn-out payments \| TempAlert
Business Acquisition [Line Items]
Earn-out payment maximum								$ 45,000,000	$ 35,000,000