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Note 6 - Other Receivables (Details Textual) - USD ($) $ in Millions | Jan. 31, 2018 | Jan. 31, 2017
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Amounts Recoverable from Funds Held in Escrow | $ 0.1 | $ 0.6

X
- 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