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Note 4 - Fair Value Measurements (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Derivative Instrument, Shares of Common Stock Held	242,000
Derivative Instrument, Common Shares Held, Per Share	$ 21
General and Administrative Expense [Member]
Derivative, Gain on Derivative	$ 1,100	$ 500	$ 0

X

- Definition

The per share amount of common shares held by certain derivative instruments entered into by the company.

+ References

No definition available.

+ Details

Name:	dsgx_DerivativeInstrumentCommonSharesHeldPerShare
Namespace Prefix:	dsgx_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares held by certain derivative instruments entered into by the company.

+ References

No definition available.

+ Details

Name:	dsgx_DerivativeInstrumentSharesOfCommonStockHeld
Namespace Prefix:	dsgx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of increase in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959

+ Details

Name:	us-gaap_DerivativeGainOnDerivative
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: