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Document And Entity Information
 12 Months Ended
Jan. 31, 2016
shares
Document and Entity Information [Abstract]  
Entity Registrant Name DESCARTES SYSTEMS GROUP INC
Trading Symbol dsgx
Document Type 40-F
Current Fiscal Year End Date --01-31
Entity Common Stock, Shares Outstanding 75,480,492
Amendment Flag false
Entity Central Index Key 0001050140
Entity Current Reporting Status Yes
Entity Voluntary Filers No
Entity Filer Category Smaller Reporting Company
Entity Well-known Seasoned Issuer No
Document Period End Date Jan. 31, 2016
Document Fiscal Year Focus 2016
Document Fiscal Period Focus FY