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Stock-Based Compensation Plans - Summary of CRSU Plan Activity (Details) - shares | 12 Months Ended
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Jan. 31, 2023 | Jan. 31, 2022 | Jan. 31, 2021
Stock-Based Compensation Plans |  |  |
Number of Units Outstanding, CRSU (in shares),Beginning | 24,428 | 38,628 |
Weighted-Average Remaining Contractual Life, CRSU (Year) | 1 year 4 months 24 days | 1 year 4 months 24 days | 1 year 6 months
Number of Units Granted, CRSU (in shares) | 7,948 | 12,776 |
Number of Units Vested and settled in cash, CRSU (in shares) | (17,719) | (26,755) |
Number of Units Forfeited, CRSU (in shares) | (74) | (221) |
Number of Units Outstanding, CRSU (in shares), Ending | 14,583 | 24,428 | 38,628
Non-vested, CRSU (in shares) | 14,583 |  |
Non-vested, Weighted-Average Remaining Contractual Life, CRSU (Year) | 1 year 4 months 24 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