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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

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- Definition The per share amount of common shares held by certain derivative instruments entered into by the company. + References No definition available. + Details
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Namespace Prefix: | dsgx_
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Period Type: | instant

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- Definition The number of shares held by certain derivative instruments entered into by the company. + References No definition available. + Details
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Namespace Prefix: | dsgx_
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- 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
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- Details
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