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Stock-Based Compensation Plans - Summary of CRSU Plan Activity (Details) - shares | 6 Months Ended | 12 Months Ended
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Jul. 31, 2024 | Jan. 31, 2024
Stock-Based Compensation Plans |  |
Number of Units Outstanding, CRSU (in shares),Beginning | 11,370 |
Weighted-Average Remaining Contractual Life, CRSU (years) | 2 years 1 month 6 days | 1 year 9 months 18 days
Number of Units Granted, CRSU (in shares) | 8,579 |
Number of Units Vested and settled in cash, CRSU (in shares) | (3,430) |
Number of Units Forfeited, CRSU (in shares) | (7) |
Number of Units Outstanding, CRSU (in shares), Ending | 16,512 | 11,370
Non-vested, CRSU (in shares) | 16,512 |
Non-vested, Weighted-Average Remaining Contractual Life, CRSU (years) | 2 years 1 month 6 days |

X
- Definition The number of nonvested CRSU awards. + References No definition available. + Details
Name: | dsgx_CRSUAwardNonvestedNumber
Namespace Prefix: | dsgx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted average remaining contractual life of nonvested CRSU awards. + References No definition available. + Details
Name: | dsgx_CRSUAwardNonvestedWeightedAverageContractualLife
Namespace Prefix: | dsgx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Related to CRSU awards forfeited in period. + References No definition available. + Details
Name: | dsgx_CRSUAwardsForfeitedInPeriod
Namespace Prefix: | dsgx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of CRSU grants in period. + References No definition available. + Details
Name: | dsgx_CRSUAwardsGrantsInPeriod
Namespace Prefix: | dsgx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of CRSU awards outstanding. + References No definition available. + Details
Name: | dsgx_CRSUAwardsOutstandingNumber
Namespace Prefix: | dsgx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of CRSU awards vested and settled in cash. + References No definition available. + Details
Name: | dsgx_CRSUAwardsVestedAndSettledInCash
Namespace Prefix: | dsgx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average remaining contractual life of CRSU awards. + References No definition available. + Details
Name: | dsgx_CRSUAwardsWeightedAverageContractualLife
Namespace Prefix: | dsgx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration