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Note 14 - Commitments, Contingencies and Guarantees (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2020 | Jan. 31, 2019
Cash Settled Restricted Share Units Nonvested Total Compensation Cost Not Yet Recognized | $ 1,100 | $ 0
Derivative Instrument, Shares of Common Stock Held | 251,422 |
Deferred Share Unit Liability, Number of Common Shares | 251,422 |
PinPoint and CORE [Member] |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | $ 10,100 |
Business Combination, Contingent Consideration Arrangements, Period for Revenue Performance Targets | 2 years |
Business Combination, Contingent Consideration, Liability, Total | $ 1,900 |

X
- Definition Represents the period (following acquisition) over which contingent consideration is to be paid by the reporting entity if the acquired entity meets certain performance targets. + References No definition available. + Details
Name: | dsgx_BusinessCombinationContingentConsiderationArrangementsPeriodForRevenuePerformanceTargets
Namespace Prefix: | dsgx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash settled restricted share units nonvested, total compensation cost not yet recognized. + References No definition available. + Details
Name: | dsgx_CashSettledRestrictedShareUnitsNonvestedTotalCompensationCostNotYetRecognized
Namespace Prefix: | dsgx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of common shares for which there is a deferred share unit liability. + References No definition available. + Details
Name: | dsgx_DeferredShareUnitLiabilityNumberOfCommonShares
Namespace Prefix: | dsgx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares held by certain derivative instruments entered into by the company. + References No definition available. + Details
Name: | dsgx_DerivativeInstrumentSharesOfCommonStockHeld
Namespace Prefix: | dsgx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=dsgx_PinpointAndCoreMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |