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Note 23 - Subsequent Event (Details Textual) $ in Thousands, £ in Millions			12 Months Ended
	Feb. 21, 2020 USD ($)	Feb. 21, 2020 GBP (£)	Jan. 31, 2020 USD ($)	Jan. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ 292,053	$ 67,932	$ 111,867
Subsequent Event [Member] | Peoplevox Limited [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total	$ 24,500	£ 18.9

X

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

+ Details

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Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

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