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Share Capital - Common Shares Outstanding (Details) - shares | 12 Months Ended
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Jan. 31, 2023 | Jan. 31, 2022 | Jan. 31, 2021
Balance, beginning of year (in shares) | 84,756,210 | 84,494,000 | 84,156,000
Stock options and share units exercised (in shares) | 64,000 | 262,000 | 338,000
Balance, end of year (in shares) | 84,820,100 | 84,756,210 | 84,494,000

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- Definition Represents the number of shares issued from the exercise of stock options and share units. + References No definition available. + Details
Name: | dsgx_StockIssuedDuringPeriodSharesOptionsAndShareUnitsExercised
Namespace Prefix: | dsgx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant