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Marketable Securities (Fair Value to Amortized Cost) (Details) - USD ($)
$ in Thousands

Mar. 31, 2019

Sep. 30, 2018

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax

$ 0

$ 0

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax

(6)

(20)

Debt Securities, Available-for-sale

2,497

^[1]

4,736

^[2]

Debt Securities, Available-for-sale, Amortized Cost

2,503

^[1]

4,756

^[2]

Available-for-sale Securities, Purchased and accrued interest

3

6

Current Assets | Certificates of Deposit

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax

0

0

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax

(6)

(20)

Debt Securities, Available-for-sale

2,497

^[1]

4,736

^[2]

Debt Securities, Available-for-sale, Amortized Cost

$ 2,503

^[1]

$ 4,756

^[2]

[1]	Included in amortized cost and fair value is purchased and accrued interest of $3
[2]	Included in amortized cost and fair value is purchased and accrued interest of $6.

X

- Definition

Available-for-sale Securities, Purchased and accrued interest

+ References

No definition available.

+ Details

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Namespace Prefix:	dgii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

+ Details

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X

- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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Period Type:	instant

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
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Namespace Prefix:
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