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Trade Accounts Receivable - Trade receivables (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2025 | Jan. 31, 2024
Trade Accounts Receivable |  |
Unbilled receivables | $ 4.6 | $ 2.4
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