Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

v3.20.2
Document And Entity Information - shares
6 Months Ended
Sep. 30, 2020
Nov. 16, 2020
Document Information [Line Items]    
Entity Registrant Name Acasti Pharma Inc.  
Entity Central Index Key 0001444192  
Trading Symbol acst  
Current Fiscal Year End Date --03-31  
Entity Filer Category Non-accelerated Filer  
Entity Current Reporting Status Yes  
Entity Emerging Growth Company false  
Entity Small Business true  
Entity Interactive Data Current Yes  
Entity Common Stock, Shares Outstanding (in shares)   96,892,537
Entity Shell Company false  
Document Type 10-Q  
Document Period End Date Sep. 30, 2020  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Title of 12(b) Security Common Shares, no par value per share