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Note 6 - Other Receivables (Details) - USD ($) $ in Millions | Jan. 31, 2016 | Jan. 31, 2015
--- | --- | ---
Other Receivables [Abstract] |  |
Amounts Recoverable From Funds Held In Escrow | $ 0.2 | $ 0.4

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

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