XML 71 R56.htm IDEA: XBRL DOCUMENT v3.21.1

Note 4 - Fair Value Measurements (Details Textual) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Derivative Instrument, Shares of Common Stock Held (in shares)	226,525
Derivative Instrument, Common Shares Held, Per Share (in dollars per share)	$ 25.70
General and Administrative Expense [Member]
Derivative, Gain on Derivative	$ 3.4	$ 4.0	$ 1.2

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121590274&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: