v3.26.1
Cover
 12 Months Ended
Mar. 31, 2026
shares
Document Information [Line Items]  
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Mar. 31, 2026
Current Fiscal Year End Date --03-31
Entity File Number 001-39498
Entity Registrant Name LIGHTSPEED COMMERCE INC.
Entity Incorporation, State or Country Code Z4
Entity Address, Address Line One 700 Saint-Antoine Street East, Suite 300
Entity Address, City or Town Montréal
Entity Address, State or Province QC
Entity Address, Country CA
Entity Address, Postal Zip Code H2Y 1A6
City Area Code (514)
Local Phone Number 907-1801
Title of 12(b) Security Subordinate Voting Shares
Trading Symbol LSPD
Security Exchange Name NYSE
Annual Information Form true
Audited Annual Financial Statements true
Entity Common Stock, Shares Outstanding 137,774,851
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction false
Amendment Flag false
Document Fiscal Year Focus 2026
Document Fiscal Period Focus FY
Entity Central Index Key 0001823306
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One 251 Little Falls Drive
Entity Address, City or Town Wilmington
Entity Address, State or Province DE
Entity Address, Postal Zip Code 19808-1674
City Area Code (800)
Local Phone Number 927-9801
Contact Personnel Name Corporation Service Company