Document and Entity Information - USD ($)
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Jul. 07, 2022
Cover [Abstract]      
Entity Registrant Name NEPTUNE WELLNESS SOLUTIONS INC.    
Entity Central Index Key 0001401395    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --03-31    
Entity Filer Category Non-accelerated Filer    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Small Business true    
Document Type 10-K    
Document Period End Date Mar. 31, 2022    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Title of 12(b) Security Common shares, no par value    
Trading Symbol NEPT    
Security Exchange Name NASDAQ    
Entity File Number 001-33526    
Entity Tax Identification Number 00-0000000    
Entity Address, Address Line One 545 Promenade du Centropolis    
Entity Address, Address Line Two Suite 100    
Entity Address, City or Town Laval    
Entity Address, State or Province QC    
Entity Address, Country CA    
Entity Address, Postal Zip Code H7T 0A3    
City Area Code 450    
Local Phone Number 687-2262    
Entity Incorporation, State or Country Code A8    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag false    
Auditor Name KPMG LLP Ernst & Young LLP  
Auditor Location Montréal, QC, Canada Montréal, QC, Canada  
Auditor Firm ID 85 1263  
Entity Common Stock, Shares Outstanding     7,614,434
Entity Public Float     $ 9,822,620
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive Proxy Statement relating to its 2022 Annual General Meeting of Shareholders to be filed with the SEC within 120 days after the end of the fiscal year ended March 31, 2022 are incorporated herein by reference in Part III.