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Cover Page
 12 Months Ended
Dec. 31, 2023
shares
Entity Addresses [Line Items]  
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2023
Current Fiscal Year End Date --12-31
Entity File Number 001-32562
Entity Registrant Name STANTEC INC.
Entity Incorporation, State or Country Code Z4
Entity Primary SIC Number 8711
Entity Tax Identification Number 98-0601423
Entity Address, Address Line One 10220-103 Avenue NW
Entity Address, Address Line Two Suite 300
Entity Address, City or Town Edmonton
Entity Address, State or Province AB
Entity Address, Country CA
Entity Address, Postal Zip Code T5J 0K4
City Area Code 780
Local Phone Number 917-7000
Title of 12(b) Security Common Shares
Trading Symbol STN
Security Exchange Name NYSE
Annual Information Form true
Audited Annual Financial Statements true
Entity Common Stock, Shares Outstanding 114,066,995
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 [Flag] true
Document Financial Statement Restatement Recovery Analysis [Flag] true
Amendment Flag false
Document Fiscal Year Focus 2023
Document Fiscal Period Focus FY
Entity Central Index Key 0001131383
Business Contact  
Entity Addresses [Line Items]  
Entity Address, Address Line One 410 17th Street
Entity Address, Address Line Two Suite 1400
Entity Address, City or Town Denver
Entity Address, State or Province CO
Entity Address, Postal Zip Code 80202-4427
City Area Code 303
Local Phone Number 295-1717
Contact Personnel Name Stantec Consulting Services Inc.