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Note 3 - Acquisitions (Details) - Acquired Intangible Assets Useful Lives	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Customer Relationships [Member] | MK Data [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives	13 years
Customer Relationships [Member] | BearWare [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives	11 years
Customer Relationships [Member] | Oz [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives	9 years
Customer Relationships [Member] | Computer Management [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives		9 years
Customer Relationships [Member] | Customs Info [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives		9 years
Customer Relationships [Member] | Airclic [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives		9 years
Customer Relationships [Member] | e-customs [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives		10 years
Customer Relationships [Member] | Pentant [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives		9 years
Customer Relationships [Member] | Impatex [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives			10 years
Customer Relationships [Member] | Compudata [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives			9 years
Customer Relationships [Member] | KSD [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives			12 years
Developed Technology Rights [Member] | MK Data [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives	7 years
Developed Technology Rights [Member] | BearWare [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives	5 years
Developed Technology Rights [Member] | Oz [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives	5 years
Developed Technology Rights [Member] | Computer Management [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives		6 years
Developed Technology Rights [Member] | Customs Info [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives		3 years
Developed Technology Rights [Member] | Airclic [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives		8 years
Developed Technology Rights [Member] | e-customs [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives		6 years
Developed Technology Rights [Member] | Pentant [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives		6 years
Developed Technology Rights [Member] | Impatex [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives			8 years
Developed Technology Rights [Member] | Compudata [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives
Developed Technology Rights [Member] | KSD [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives			8 years
Trade Names [Member] | MK Data [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives	5 years
Trade Names [Member] | BearWare [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives	5 years
Trade Names [Member] | Oz [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives	3 years
Trade Names [Member] | Computer Management [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives
Trade Names [Member] | Customs Info [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives		15 years
Trade Names [Member] | Airclic [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives
Trade Names [Member] | e-customs [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives
Trade Names [Member] | Pentant [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives
Noncompete Agreements [Member] | MK Data [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives
Noncompete Agreements [Member] | BearWare [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives
Noncompete Agreements [Member] | Oz [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives	5 years
Noncompete Agreements [Member] | Computer Management [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives
Noncompete Agreements [Member] | Customs Info [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives		12 years
Noncompete Agreements [Member] | Airclic [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives		12 years
Noncompete Agreements [Member] | e-customs [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives		12 years
Noncompete Agreements [Member] | Pentant [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives
Noncompete Agreements [Member] | Impatex [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives
Noncompete Agreements [Member] | Compudata [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives			3 years
Noncompete Agreements [Member] | KSD [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets estimated useful lives

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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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Details

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- Details

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X

- Details

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X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dsgx_OzMember
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X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dsgx_ComputerManagementMember
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X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dsgx_CustomsInfoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dsgx_AirclicMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dsgx_EcustomsMember
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X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dsgx_PentantMember
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X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dsgx_ImpatexMember
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X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dsgx_CompudataMember
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X

- Details

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- Details

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- Details

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- Details

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