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Stock-Based Compensation (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Jan. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Proceeds from stock option plan transactions | $ 9,000 us-gaap_ProceedsFromStockOptionsExercised | $ 2,813,000 us-gaap_ProceedsFromStockOptionsExercised |
Excess tax benefits from stock-based compensation | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | (20,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |
Total intrinsic value of all options exercised |  | 400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |
Forfeiture rate | 6.00%dgii_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedForfeitureRate |  |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | 4 years 8 months 12 days |  |
Total unrecognized compensation cost nonvested awards | 5,300,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Weighted average period, unrecognized compensation cost, nonvested awards | 3 years 2 months 12 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term | 3 years 8 months 12 days |  |
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average period, unrecognized compensation cost, nonvested awards | 1 year 9 months 18 days |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | 3,600,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |
The 2014 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized |  |  | 2,250,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = dgii_The2014PlanMember
Number of shares available for future grants | 372,572 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = dgii_The2014PlanMember |  |
The 2014 Plan | Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period | 8 years |  |
Vesting period | 4 years |  |
The Purchase Plan | The Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of continuous days of service | 90 days |  |
Number of hours per week employed | 20 hours |  |
Percent of market value | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember / us-gaap_PlanNameAxis = dgii_EmployeeStockPurchasePlanMember |  |
Offering period | 3 months |  |
Employee contributions | $ 261,000 dgii_ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeeWithholding / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember / us-gaap_PlanNameAxis = dgii_EmployeeStockPurchasePlanMember | $ 296,000 dgii_ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeeWithholding / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember / us-gaap_PlanNameAxis = dgii_EmployeeStockPurchasePlanMember |
Common shares issued to employees | 40,950 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember / us-gaap_PlanNameAxis = dgii_EmployeeStockPurchasePlanMember | 35,048 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember / us-gaap_PlanNameAxis = dgii_EmployeeStockPurchasePlanMember |
Shares available for future issuance | 700,428 dgii_ShareBasedCompensationEmployeeStockPurchasePlanSharesAvailableForFuturePurchase / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember / us-gaap_PlanNameAxis = dgii_EmployeeStockPurchasePlanMember |  |
Director | The 2014 Plan | Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
Executive Officer | The 2014 Plan | Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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