v3.25.1
Material Accounting Policies - Summary of Primary Subsidiaries (Details)
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Alithya Canada Inc.    
Disclosure of subsidiaries [line items]    
Entity Alithya Canada Inc.  
Jurisdiction Quebec, Canada  
Percentage ownership (in percentage) 100.00% 100.00%
Alithya Consulting Inc.    
Disclosure of subsidiaries [line items]    
Entity Alithya Consulting Inc.  
Jurisdiction Quebec, Canada  
Percentage ownership (in percentage) 100.00% 100.00%
XRM Vision Inc.    
Disclosure of subsidiaries [line items]    
Entity XRM Vision Inc.  
Jurisdiction Quebec, Canada  
Percentage ownership (in percentage) 100.00%  
Alithya Digital Technology Corporation    
Disclosure of subsidiaries [line items]    
Entity Alithya Digital Technology Corporation  
Jurisdiction Ontario, Canada  
Percentage ownership (in percentage) 100.00% 100.00%
Alithya USA, Inc.    
Disclosure of subsidiaries [line items]    
Entity Alithya USA, Inc.  
Jurisdiction Delaware, USA  
Percentage ownership (in percentage) 100.00% 100.00%
Alithya Financial Solutions, Inc.    
Disclosure of subsidiaries [line items]    
Entity Alithya Financial Solutions, Inc.  
Jurisdiction Delaware, USA  
Percentage ownership (in percentage) 100.00% 100.00%
Alithya Ranzal LLC    
Disclosure of subsidiaries [line items]    
Entity Alithya Ranzal LLC  
Jurisdiction Delaware, USA  
Percentage ownership (in percentage) 100.00% 100.00%
Alithya Zero2Ten, Inc.    
Disclosure of subsidiaries [line items]    
Entity Alithya Zero2Ten, Inc.  
Jurisdiction Delaware, USA  
Percentage ownership (in percentage) 100.00% 100.00%
Alithya Fullscope Solutions, Inc.    
Disclosure of subsidiaries [line items]    
Entity Alithya Fullscope Solutions, Inc.  
Jurisdiction Delaware, USA  
Percentage ownership (in percentage) 100.00% 100.00%
Vitalyst, LLC    
Disclosure of subsidiaries [line items]    
Entity Vitalyst, LLC  
Jurisdiction Delaware, USA  
Percentage ownership (in percentage) 100.00% 100.00%
Datum Consulting Group, LLC    
Disclosure of subsidiaries [line items]    
Entity Datum Consulting Group, LLC  
Jurisdiction Indiana, USA  
Percentage ownership (in percentage) 100.00% 100.00%
Alithya France SAS    
Disclosure of subsidiaries [line items]    
Entity Alithya France SAS  
Jurisdiction France  
Percentage ownership (in percentage) 100.00% 100.00%
DCG Team UK Limited    
Disclosure of subsidiaries [line items]    
Entity DCG Team UK Limited  
Jurisdiction United Kingdom  
Percentage ownership (in percentage) 100.00% 100.00%
Alithya Numérique Maroc SARLAU    
Disclosure of subsidiaries [line items]    
Entity Alithya Numérique Maroc SARLAU  
Jurisdiction Morocco  
Percentage ownership (in percentage) 100.00% 100.00%
XRM Vision Maroc SARLAU    
Disclosure of subsidiaries [line items]    
Entity XRM Vision Maroc SARLAU  
Jurisdiction Morocco  
Percentage ownership (in percentage) 100.00%  
Datum Cybertech India Pvt Ltd.    
Disclosure of subsidiaries [line items]    
Entity Datum Cybertech India Pvt Ltd.  
Jurisdiction India  
Percentage ownership (in percentage) 100.00% 100.00%