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Note 16 - Stock-based Compensation Plans - Summary of CRSU Plan Activity (Details) - shares | 12 Months Ended
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Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Number of Units Outstanding, CRSU (in shares) | 100,749 | 113,856 |
Weighted-Average Remaining Contractual Life, CRSU (Year) | 1 year 146 days | 1 year 219 days | 1 year 182 days
Number of Units Granted, CRSU (in shares) | 43,218 | 72,817 |
Number of Units Vested and settled in cash, CRSU (in shares) | (66,638) | (85,924) |
Number of Units Outstanding, CRSU (in shares) | 77,329 | 100,749 | 113,856
Non-vested at January 31, 2016, CRSU (in shares) | 77,329 |  |
Non-vested at January 31, 2016, Weighted-Average Remaining Contractual Life, CRSU (Year) | 1 year 146 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 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