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Quarterly Financial Data - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |
Net discrete tax expense (benefits) | $ (0.3) | $ (0.2) | $ (0.1) | $ (1.5) | $ 0.1 | $ 0.2 | $ 2.8

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- Definition Income Tax Expense (Benefit) Specific to the Period + References No definition available. + Details
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Namespace Prefix: | dgii_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration