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Note 20 - Segmented Information - Segmented Revenue by Revenue Type (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Segmented Revenue | $ 237,439 | $ 203,779 | $ 184,993
Services [Member] |  |  |
Segmented Revenue | 229,294 | 196,867 | 176,288
Licenses [Member] |  |  |
Segmented Revenue | $ 8,145 | $ 6,912 | $ 8,705

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=dsgx_ServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=dsgx_LicensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |