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Note 3 - Acquisitions - Acquired Intangible Assets Useful Lives (Details)	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Customer Relationships [Member] | ShipRush [Member]
Acquired intangible assets estimated useful lives (Year)	9 years
Customer Relationships [Member] | PCSTrac, Inc. [Member]
Acquired intangible assets estimated useful lives (Year)	13 years
Customer Relationships [Member] | MacroPoint LLC [Member]
Acquired intangible assets estimated useful lives (Year)	12 years
Customer Relationships [Member] | Pixie Software GmbH [Member]
Acquired intangible assets estimated useful lives (Year)		9 years
Customer Relationships [Member] | Appterra LLC [Member]
Acquired intangible assets estimated useful lives (Year)		11 years
Customer Relationships [Member] | 4Solututions Information Technology [Member]
Acquired intangible assets estimated useful lives (Year)		8 years
Customer Relationships [Member] | Datamyne Inc [Member]
Acquired intangible assets estimated useful lives (Year)		9 years
Customer Relationships [Member] | MK Data [Member]
Acquired intangible assets estimated useful lives (Year)			13 years
Customer Relationships [Member] | BearWare [Member]
Acquired intangible assets estimated useful lives (Year)			11 years
Customer Relationships [Member] | Oz [Member]
Acquired intangible assets estimated useful lives (Year)			9 years
Existing Technology [Member] | ShipRush [Member]
Acquired intangible assets estimated useful lives (Year)	5 years
Existing Technology [Member] | PCSTrac, Inc. [Member]
Acquired intangible assets estimated useful lives (Year)	5 years
Existing Technology [Member] | MacroPoint LLC [Member]
Acquired intangible assets estimated useful lives (Year)	5 years
Existing Technology [Member] | Pixie Software GmbH [Member]
Acquired intangible assets estimated useful lives (Year)		5 years
Existing Technology [Member] | Appterra LLC [Member]
Acquired intangible assets estimated useful lives (Year)		5 years
Existing Technology [Member] | 4Solututions Information Technology [Member]
Acquired intangible assets estimated useful lives (Year)		2 years
Existing Technology [Member] | Datamyne Inc [Member]
Acquired intangible assets estimated useful lives (Year)		6 years
Existing Technology [Member] | MK Data [Member]
Acquired intangible assets estimated useful lives (Year)			7 years
Existing Technology [Member] | BearWare [Member]
Acquired intangible assets estimated useful lives (Year)			5 years
Existing Technology [Member] | Oz [Member]
Acquired intangible assets estimated useful lives (Year)			5 years
Trade Names [Member] | ShipRush [Member]
Acquired intangible assets estimated useful lives (Year)	8 years
Trade Names [Member] | PCSTrac, Inc. [Member]
Acquired intangible assets estimated useful lives (Year)	4 years
Trade Names [Member] | MacroPoint LLC [Member]
Acquired intangible assets estimated useful lives (Year)	8 years
Trade Names [Member] | 4Solututions Information Technology [Member]
Acquired intangible assets estimated useful lives (Year)		5 years
Trade Names [Member] | Datamyne Inc [Member]
Acquired intangible assets estimated useful lives (Year)		9 years
Trade Names [Member] | MK Data [Member]
Acquired intangible assets estimated useful lives (Year)			5 years
Trade Names [Member] | BearWare [Member]
Acquired intangible assets estimated useful lives (Year)			5 years
Trade Names [Member] | Oz [Member]
Acquired intangible assets estimated useful lives (Year)			3 years
Noncompete Agreements [Member] | ShipRush [Member]
Acquired intangible assets estimated useful lives (Year)	5 years
Noncompete Agreements [Member] | PCSTrac, Inc. [Member]
Acquired intangible assets estimated useful lives (Year)	5 years
Noncompete Agreements [Member] | MacroPoint LLC [Member]
Acquired intangible assets estimated useful lives (Year)	5 years
Noncompete Agreements [Member] | Appterra LLC [Member]
Acquired intangible assets estimated useful lives (Year)		5 years
Noncompete Agreements [Member] | Datamyne Inc [Member]
Acquired intangible assets estimated useful lives (Year)		5 years
Noncompete Agreements [Member] | Oz [Member]
Acquired intangible assets estimated useful lives (Year)			5 years

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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- Details

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X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dsgx_DatamyneIncMember
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X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=dsgx_MKDataMember
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X

- Details

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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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