Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income	$ 1,107us-gaap_NetIncomeLoss	$ 1,426us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, equipment and improvements	1,445us-gaap_Depreciation	1,828us-gaap_Depreciation
Amortization of identifiable intangible assets	1,537us-gaap_AmortizationOfIntangibleAssets	1,891us-gaap_AmortizationOfIntangibleAssets
Stock-based compensation	2,222us-gaap_ShareBasedCompensation	2,070us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based compensation	0	(44)
Deferred income tax provision (benefit)	2,212us-gaap_DeferredIncomeTaxExpenseBenefit	(1,065)us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on insurance settlement related to property and equipment	(989)	0
Bad debt/product return provision	518us-gaap_ProvisionForDoubtfulAccounts	(151)us-gaap_ProvisionForDoubtfulAccounts
Inventory obsolescence	476us-gaap_InventoryWriteDown	409us-gaap_InventoryWriteDown
Restructuring charges, net	518dgii_RestructuringChargeNet	81dgii_RestructuringChargeNet
Other	(27)us-gaap_OtherNoncashIncomeExpense	46us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities	(7,459)	(9,681)
Net cash provided by (used in) operating activities	1,560	(3,190)
Investing activities:
Purchase of marketable securities	(22,099)	(5,157)
Proceeds from maturities of marketable securities	19,763	13,778
Proceeds from insurance settlement related to property and equipment	1,014	0
Proceeds from sale of property and equipment	45	0
Purchase of property, equipment, improvements and certain other intangible assets	(3,035)	(1,921)
Net cash (used in) provided by investing activities	(4,312)	6,700
Financing activities:
Excess tax benefits from stock-based compensation	0	44
Proceeds from stock option plan transactions	6,006	3,209
Proceeds from employee stock purchase plan transactions	505us-gaap_ProceedsFromStockPlans	561us-gaap_ProceedsFromStockPlans
Purchases of common stock	(2,339)	(5,416)
Net cash provided by (used in) financing activities	4,172	(1,602)
Effect of exchange rate changes on cash and cash equivalents	(3,253)	329
Net (decrease) increase in cash and cash equivalents	(1,833)	2,237
Cash and cash equivalents, beginning of period	47,490	41,320
Cash and cash equivalents, end of period	$ 45,657	$ 43,557

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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