| Document and Entity Information | Feb. 24, 2021 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 24, 2021 |
| Entity File Number | 001-38163 |
| Entity Registrant Name | PETIQ, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 35-2554312 |
| Entity Address, Address Line One | 923 S. Bridgeway Pl |
| Entity Address, State or Province | ID |
| Entity Address, City or Town | Eagle |
| Entity Address, Postal Zip Code | 83616 |
| City Area Code | 208 |
| Local Phone Number | 939-8900 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A common stock, par value $0.001 per share |
| Trading Symbol | PETQ |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001668673 |
| Amendment Flag | false |
| Current Fiscal Year End Date | --12-31 |
