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Document And Entity Information
 12 Months Ended
Jan. 31, 2018
shares
Document Information [Line Items]  
Entity Registrant Name DESCARTES SYSTEMS GROUP INC
Entity Central Index Key 0001050140
Trading Symbol dsgx
Current Fiscal Year End Date --01-31
Entity Filer Category Smaller Reporting Company
Entity Current Reporting Status Yes
Entity Voluntary Filers No
Entity Well-known Seasoned Issuer No
Entity Common Stock, Shares Outstanding (in shares) 76,773,497
Document Type 40-F
Document Period End Date Jan. 31, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus FY
Amendment Flag false