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Note 19 - Other Charges (Details Textual) - Workforce Reduction Charges, Office Closure Costs and Network Consolidation Costs [Member] - USD ($) $ in Millions	Jan. 31, 2017	Jan. 31, 2016
Fiscal 2017 Restructuring Plan [Member]
Restructuring and Related Cost, Cost Incurred to Date	$ 0.4
Fiscal 2015 Restructuring Plan [Member]
Restructuring and Related Cost, Cost Incurred to Date		$ 0.8

X

- Definition

Amount of costs incurred to date for the specified restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

+ Details

Name:	us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=dsgx_WorkforceReductionChargesOfficeClosureCostsAndNetworkConsolidationCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RestructuringPlanAxis=dsgx_Fiscal2017RestructuringPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RestructuringPlanAxis=dsgx_Fiscal2015RestructuringPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: