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Note 6 - Other Receivables - Other Receivables (Details) - USD ($) $ in Thousands	Jan. 31, 2018	Jan. 31, 2017
Net working capital adjustments receivable from acquisitions	$ 118	$ 565
Other receivables	3,053	3,144
	$ 3,171	$ 3,709

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

- Definition

Amount of current assets classified as other.

+ 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

Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

+ References

No definition available.

+ Details

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