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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%

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- 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