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Document and Entity Information - shares
 6 Months Ended
Sep. 30, 2024
Nov. 13, 2024
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2024  
Current Fiscal Year End Date --03-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Document Transition Report false  
Entity File Number 001-35776  
Entity Registrant Name Grace Therapeutics, Inc.  
Entity Central Index Key 0001444192  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 98-1359336  
Entity Address, Address Line One 103 Carnegie Center Suite 300  
Entity Address, City or Town Princeton  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 08540  
City Area Code 609  
Local Phone Number 322-1602  
Entity Information, Former Legal or Registered Name Acasti Pharma Inc.  
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Trading Symbol GRCE  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   10,139,861