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v3.24.2.u1

Income Taxes - Additional information (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2024 | Jul. 31, 2023 | Jul. 31, 2024 | Jul. 31, 2023
Income Taxes |  |  |  |
Percentage of income before income taxes | 28.20% | 27.00% | 26.60% | 24.70%

X
- Definition Income tax expense expressed as a percentage of income before taxes. + References No definition available. + Details
Name: | dsgx_IncomeBeforeTaxesPercent
Namespace Prefix: | dsgx_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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