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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