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Income Taxes - Additional information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Income Taxes
Percentage of income before income taxes	23.20%	28.20%	23.80%	26.60%
Decreased current tax expense	$ 6.0		$ 6.0
Increased deferred tax expense	$ 6.0		$ 6.0

X

- Definition

Income tax expense expressed as a percentage of income before taxes.

+ References

No definition available.

+ Details

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X

- Definition

Amount of increase (decrease) in current income tax expense (benefit) due to changes in tax law.

+ References

No definition available.

+ Details

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Namespace Prefix:	dsgx_
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X

- Definition

Amount of increase (decrease) in deferred income tax expense (benefit) due to changes in tax law.

+ References

No definition available.

+ Details

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Namespace Prefix:	dsgx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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