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Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Deferred Compensation Arrangement With Individual Post Retirement Benefits [Line Items] |  |  |
Maximum annual contribution per employee percenatge | 25.00% |  |
Matching contributions, amount | $ 1.3 | $ 1.3 | $ 1.1
Full Employer Match [Member] |  |  |
Deferred Compensation Arrangement With Individual Post Retirement Benefits [Line Items] |  |  |
Employeer contribution percentage | 100.00% |  |
Employee contribution percentage | 3.00% |  |
Half Employer Match [Member] |  |  |
Deferred Compensation Arrangement With Individual Post Retirement Benefits [Line Items] |  |  |
Employeer contribution percentage | 50.00% |  |
Employee contribution percentage | 2.00% |  |

X
- Definition Defined Contribution Plan, Contributions by Employer + References No definition available. + Details
Name: | dgii_DefinedContributionPlanContributionsByEmployer
Namespace Prefix: | dgii_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Defined Contribution Plan, Employee Contribution, Percent + References No definition available. + Details
Name: | dgii_DefinedContributionPlanEmployeeContributionPercent
Namespace Prefix: | dgii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration