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Document And Entity Information
 12 Months Ended
Jan. 31, 2022
shares
Document Information [Line Items]  
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Jan. 31, 2022
Entity File Number 000-29970
Entity Registrant Name DESCARTES SYSTEMS GROUP INC
Entity Incorporation, State or Country Code Z4
Entity Address, Address Line One 120 Randall Drive
Entity Address, City or Town Waterloo
Entity Address, State or Province ON
Entity Address, Country CA
Entity Address, Postal Zip Code N2V 1C6
City Area Code 519
Local Phone Number 746-8110
Annual Information Form true
Audited Annual Financial Statements true
Entity Common Stock, Shares Outstanding (in shares) 84,756,210
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
Auditor Name KPMG LLP
Auditor Firm ID 85
Auditor Location Toronto, ON, Canada
Entity Central Index Key 0001050140
Current Fiscal Year End Date --01-31
Document Fiscal Year Focus 2022
Document Fiscal Period Focus FY
Amendment Flag false
Business Contact [Member]  
Document Information [Line Items]  
Contact Personnel Name Descartes Systems (USA) LLC
Entity Address, Address Line One Powers Ferry Business Park
Entity Address, Address Line Two 2030 Powers Ferry Road SE
Entity Address, Address Line Three Suite 350
Entity Address, City or Town Atlanta
Entity Address, State or Province GA
Entity Address, Postal Zip Code 30339-5066
City Area Code 678
Local Phone Number 247-0400
Common Stock [Member]  
Document Information [Line Items]  
Title of 12(b) Security Common Shares, no par value
Trading Symbol DSGX
Security Exchange Name NASDAQ
Rights to purchase Common Shares [Member]  
Document Information [Line Items]  
Title of 12(b) Security Rights to purchase Common Shares, no par value
Trading Symbol DSGX
Security Exchange Name NASDAQ