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Trade Accounts Receivable - Trade receivables (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2024	Jan. 31, 2023
Trade Accounts Receivable
Unbilled receivables	$ 2.4	$ 0.3
Percentage of account receivable	10.00%	10.00%

X

- Definition

Represent of percentage item

+ References

No definition available.

+ Details

Name:	dsgx_PercentageOfAccountReceivable
Namespace Prefix:	dsgx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	us-gaap_UnbilledReceivablesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant