Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Revenue:
Hardware product revenue	$ 48,108us-gaap_SalesRevenueGoodsNet	$ 40,560us-gaap_SalesRevenueGoodsNet	$ 93,041us-gaap_SalesRevenueGoodsNet	$ 82,549us-gaap_SalesRevenueGoodsNet
Service revenue	5,043us-gaap_SalesRevenueServicesNet	5,322us-gaap_SalesRevenueServicesNet	8,833us-gaap_SalesRevenueServicesNet	10,655us-gaap_SalesRevenueServicesNet
Total revenue	53,151us-gaap_SalesRevenueNet	45,882us-gaap_SalesRevenueNet	101,874us-gaap_SalesRevenueNet	93,204us-gaap_SalesRevenueNet
Cost of sales:
Cost of hardware product	25,498us-gaap_CostOfGoodsSold	20,012us-gaap_CostOfGoodsSold	48,610us-gaap_CostOfGoodsSold	40,275us-gaap_CostOfGoodsSold
Cost of service	3,575us-gaap_CostOfServices	4,090us-gaap_CostOfServices	7,264us-gaap_CostOfServices	8,241us-gaap_CostOfServices
Total cost of sales	29,073us-gaap_CostOfGoodsAndServicesSold	24,102us-gaap_CostOfGoodsAndServicesSold	55,874us-gaap_CostOfGoodsAndServicesSold	48,516us-gaap_CostOfGoodsAndServicesSold
Gross profit	24,078us-gaap_GrossProfit	21,780us-gaap_GrossProfit	46,000us-gaap_GrossProfit	44,688us-gaap_GrossProfit
Operating expenses:
Sales and marketing	10,299us-gaap_SellingAndMarketingExpense	10,399us-gaap_SellingAndMarketingExpense	21,091us-gaap_SellingAndMarketingExpense	20,618us-gaap_SellingAndMarketingExpense
Research and development	7,779	7,411	15,341	14,668
General and administrative	4,540us-gaap_GeneralAndAdministrativeExpense	4,619us-gaap_GeneralAndAdministrativeExpense	9,728us-gaap_GeneralAndAdministrativeExpense	9,342us-gaap_GeneralAndAdministrativeExpense
Restructuring charges, net	518dgii_RestructuringChargeNet	0dgii_RestructuringChargeNet	518dgii_RestructuringChargeNet	81dgii_RestructuringChargeNet
Total operating expenses	23,136us-gaap_OperatingExpenses	22,429us-gaap_OperatingExpenses	46,678us-gaap_OperatingExpenses	44,709us-gaap_OperatingExpenses
Operating income (loss)	942us-gaap_OperatingIncomeLoss	(649)us-gaap_OperatingIncomeLoss	(678)us-gaap_OperatingIncomeLoss	(21)us-gaap_OperatingIncomeLoss
Other income, net:
Interest income, net	54us-gaap_InvestmentIncomeInterest	49us-gaap_InvestmentIncomeInterest	92us-gaap_InvestmentIncomeInterest	92us-gaap_InvestmentIncomeInterest
Other income, net	1,324us-gaap_OtherNonoperatingIncomeExpense	21us-gaap_OtherNonoperatingIncomeExpense	1,712us-gaap_OtherNonoperatingIncomeExpense	114us-gaap_OtherNonoperatingIncomeExpense
Total other income, net	1,378dgii_OtherIncomeNet	70dgii_OtherIncomeNet	1,804dgii_OtherIncomeNet	206dgii_OtherIncomeNet
Income (loss) before income taxes	2,320	(579)	1,126	185
Income tax provision (benefit)	874us-gaap_IncomeTaxExpenseBenefit	(1,317)us-gaap_IncomeTaxExpenseBenefit	19us-gaap_IncomeTaxExpenseBenefit	(1,241)us-gaap_IncomeTaxExpenseBenefit
Net income	$ 1,446us-gaap_NetIncomeLoss	$ 738us-gaap_NetIncomeLoss	$ 1,107us-gaap_NetIncomeLoss	$ 1,426us-gaap_NetIncomeLoss
Net income per common share:
Basic (USD per share)	$ 0.06us-gaap_EarningsPerShareBasic	$ 0.03us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ 0.06us-gaap_EarningsPerShareBasic
Net income per common share, diluted (USD per share)	$ 0.06us-gaap_EarningsPerShareDiluted	$ 0.03us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted
Weighted average common shares:
Basic (shares)	24,492	25,644	24,319	25,680
Diluted (shares)	25,273	26,144	24,816	26,189

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-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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