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Restructuring Restructuring (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended	0 Months Ended		12 Months Ended	0 Months Ended	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Sep. 30, 2014	Oct. 31, 2013 employees	Sep. 27, 2013 employees	Sep. 30, 2013	Feb. 20, 2015 employees	Mar. 31, 2015	Jan. 22, 2015 employees
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 518us-gaap_RestructuringCharges	$ 152us-gaap_RestructuringCharges
Payments for Restructuring	(342)us-gaap_PaymentsForRestructuring	(431)us-gaap_PaymentsForRestructuring
Restructuring Reserve, Accrual Adjustment		(71)us-gaap_RestructuringReserveAccrualAdjustment
Restructuring Reserve	176us-gaap_RestructuringReserve	0us-gaap_RestructuringReserve			350us-gaap_RestructuringReserve		176us-gaap_RestructuringReserve
Fiscal 2014 Restructuring
Restructuring Cost and Reserve [Line Items]
Number of employees eliminated			40us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RestructuringPlanAxis = dgii_A2014RestructuringMember
Fiscal 2013 Restructuring
Restructuring Cost and Reserve [Line Items]
Number of employees eliminated				15us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RestructuringPlanAxis = dgii_A2013RestructuringMember
Employee Termination Costs | Fiscal 2015 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charge	518us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2015RestructuringMember	0us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2015RestructuringMember
Payments for Restructuring	(342)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2015RestructuringMember	0us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2015RestructuringMember
Restructuring Reserve, Accrual Adjustment		0us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2015RestructuringMember
Restructuring Reserve	176us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2015RestructuringMember	0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2015RestructuringMember			0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2015RestructuringMember		176us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2015RestructuringMember
Employee Termination Costs | Fiscal 2014 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charge	0us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2014RestructuringMember	152us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2014RestructuringMember
Payments for Restructuring	0us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2014RestructuringMember	(152)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2014RestructuringMember
Restructuring Reserve, Accrual Adjustment		0us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2014RestructuringMember
Restructuring Reserve	0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2014RestructuringMember	0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2014RestructuringMember			0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2014RestructuringMember		0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2014RestructuringMember
Employee Termination Costs | Fiscal 2013 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charge	0us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2013RestructuringMember	0us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2013RestructuringMember			350us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2013RestructuringMember
Payments for Restructuring	0us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2013RestructuringMember	(279)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2013RestructuringMember
Restructuring Reserve, Accrual Adjustment		(71)us-gaap_RestructuringReserveAccrualAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2013RestructuringMember
Restructuring Reserve	0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2013RestructuringMember	0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2013RestructuringMember			350us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2013RestructuringMember		0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2013RestructuringMember
UNITED STATES | Fiscal 2015 Restructuring
Restructuring Cost and Reserve [Line Items]
Number of employees eliminated						21us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RestructuringPlanAxis = dgii_A2015RestructuringMember / us-gaap_StatementGeographicalAxis = country_US
UNITED STATES | Employee Termination Costs | Fiscal 2015 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charge							300us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = dgii_A2015RestructuringMember / us-gaap_StatementGeographicalAxis = country_US
INDIA | Fiscal 2015 Restructuring
Restructuring Cost and Reserve [Line Items]
Number of employees eliminated								38us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated / us-gaap_RestructuringPlanAxis = dgii_A2015RestructuringMember / us-gaap_StatementGeographicalAxis = country_IN
INDIA | Employee Termination Costs | Fiscal 2015 Restructuring
Restructuring Cost and Reserve [Line Items]
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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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