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Commitments, Contingencies and Guarantees (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2022	Jan. 31, 2022
Loss Contingencies [Line Items]
Deferred Share Units Nonvested Total Compensation Cost Not Yet Recognized	$ 900
Cash Settled Restricted Share Units Nonvested Total Compensation Cost Not Yet Recognized	$ 1,100
Derivative Instrument, Shares of Common Stock Held (in shares)	281,768
Deferred Share Unit Liability, Number of Common Shares (in shares)	281,768
Fair value of the contingent considerations	$ 27,579	$ 12,990
CORE, Kontainers, ShipTrack, GreenMile, NetCHB And XPS [Member]
Loss Contingencies [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 157,800
Business Combination, Contingent Consideration Arrangements, Period for Revenue Performance Targets (Year)	2 years
Fair value of the contingent considerations	$ 27,600

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

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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

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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 deferred share units nonvested, total compensation cost not yet recognized.

+ References

No definition available.

+ Details

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Namespace Prefix:	dsgx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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=120321790&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=120321790&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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: