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Note 6 - Other Receivables (Details) - Other Receivables - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Other Receivables [Abstract]
Net working capital adjustments receivable from acquisitions	$ 193	$ 372
Other receivables	2,938	2,885
	$ 3,131	$ 3,257

X

- Definition

Net working capital adjustments receivable from acquisitions.

+ References

No definition available.

+ Details

Name:	dsgx_NetWorkingCapitalAdjustmentsReceivableFromAcquisitions
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

X

- Definition

Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_OtherAssetsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The carrying amount of other receivables, net, due within one year of the balance sheet date (or one operating cycle, if longer) from third parties or arising from transactions not separately disclosed.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherReceivablesNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant