| Document And Entity Information | Jul. 29, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jul. 29, 2022 |
| Entity Registrant Name | NEPTUNE WELLNESS SOLUTIONS INC. |
| Entity Central Index Key | 0001401395 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-33526 |
| Entity Incorporation, State or Country Code | A8 |
| 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 Information, Former Legal or Registered Name | N/A |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Shares, no par value per share |
| Trading Symbol | NEPT |
| Security Exchange Name | NASDAQ |
