XML 84 R69.htm IDEA: XBRL DOCUMENT v3.8.0.1

Note 14 - Share Capital (Details Textual) - USD ($) $ in Millions		12 Months Ended
	Apr. 18, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Proceeds from Stock Options Exercised		$ 1.0	$ 0.6	$ 0.2
Shelf Prospectus [Member]
Shelf Prospectus Period	2 years 30 days
Shelf Prospectus, Maximum Amount	$ 500.0

X

- Definition

The maximum amount related to the shelf prospectus.

+ References

No definition available.

+ Details

Name:	dsgx_ShelfProspectusMaximumAmount
Namespace Prefix:	dsgx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The duration of the shelf prospectus.

+ References

No definition available.

+ Details

Name:	dsgx_ShelfProspectusPeriod
Namespace Prefix:	dsgx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901

+ Details

Name:	us-gaap_ProceedsFromStockOptionsExercised
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=dsgx_ShelfProspectusMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: