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Other Receivables - Additional information (Details) - USD ($) $ in Millions | Jul. 31, 2024 | Jan. 31, 2024
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Other Receivables |  |
Amounts Recoverable from Funds Held in Escrow - Net working capital adjustments receivable from acquisitions | $ 0.3 | $ 0.0

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- Definition Amount recoverable from funds held In escrow related to acquisitions. + References No definition available. + Details
Name: | dsgx_AmountsRecoverableFromFundsHeldInEscrow
Namespace Prefix: | dsgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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