Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Revenue:
Hardware product revenue	$ 44,933us-gaap_SalesRevenueGoodsNet	$ 41,989us-gaap_SalesRevenueGoodsNet
Service revenue	3,790us-gaap_SalesRevenueServicesNet	5,333us-gaap_SalesRevenueServicesNet
Total revenue	48,723us-gaap_SalesRevenueNet	47,322us-gaap_SalesRevenueNet
Cost of sales:
Cost of hardware product	23,112us-gaap_CostOfGoodsSold	20,263us-gaap_CostOfGoodsSold
Cost of service	3,689us-gaap_CostOfServices	4,151us-gaap_CostOfServices
Total cost of sales	26,801us-gaap_CostOfGoodsAndServicesSold	24,414us-gaap_CostOfGoodsAndServicesSold
Gross profit	21,922us-gaap_GrossProfit	22,908us-gaap_GrossProfit
Operating expenses:
Sales and marketing	10,792us-gaap_SellingAndMarketingExpense	10,219us-gaap_SellingAndMarketingExpense
Research and development	7,562	7,257
General and administrative	5,188us-gaap_GeneralAndAdministrativeExpense	4,723us-gaap_GeneralAndAdministrativeExpense
Restructuring charges, net	0dgii_RestructuringChargeNet	81dgii_RestructuringChargeNet
Total operating expenses	23,542us-gaap_OperatingExpenses	22,280us-gaap_OperatingExpenses
Operating (loss) income	(1,620)us-gaap_OperatingIncomeLoss	628us-gaap_OperatingIncomeLoss
Other income, net:
Interest income	38us-gaap_InvestmentIncomeInterest	43us-gaap_InvestmentIncomeInterest
Other income, net	388us-gaap_OtherNonoperatingIncomeExpense	93us-gaap_OtherNonoperatingIncomeExpense
Total other income, net	426dgii_OtherIncomeNet	136dgii_OtherIncomeNet
(Loss) income before income taxes	(1,194)	764
Income tax (benefit) provision	(855)us-gaap_IncomeTaxExpenseBenefit	76us-gaap_IncomeTaxExpenseBenefit
Net (loss) income	$ (339)us-gaap_NetIncomeLoss	$ 688us-gaap_NetIncomeLoss
Net (loss) income per common share:
Basic (USD per share)	$ (0.01)us-gaap_EarningsPerShareBasic	$ 0.03us-gaap_EarningsPerShareBasic
Diluted (USD per share)	$ (0.01)us-gaap_EarningsPerShareDiluted	$ 0.03us-gaap_EarningsPerShareDiluted
Weighted average common shares:
Basic (shares)	24,150	25,716
Diluted (shares)	24,150	26,229

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