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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
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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

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- 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

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

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

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