| Document and Entity Information | Feb. 11, 2021 |
| Document And Entity Information [Line Items] | |
| Entity Registrant Name | CENTRAL GARDEN & PET CO |
| Amendment Flag | true |
| Entity Central Index Key | 0000887733 |
| Document Type | 8-K/A |
| Document Period End Date | Feb. 11, 2021 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-33268 |
| Entity Tax Identification Number | 68-0275553 |
| Entity Address, Address Line One | 1340 Treat Boulevard |
| Entity Address, Address Line Two | Suite 600 |
| Entity Address, City or Town | Walnut Creek |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94597 |
| City Area Code | (925) |
| Local Phone Number | 948-4000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Description | On April 16, 2021, the Company filed Amendment No. 1 to the Prior 8-K to provide the audited consolidated financial statements of Green Garden as of and for the fiscal year ended September 30, 2020. This Amendment No. 2 is being filed to include the unaudited financial statements for the fiscal quarters ended December 31, 2020 and 2019 and the unaudited pro forma financial statements giving effect to the Acquisition. |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock |
| Trading Symbol | CENT |
| Security Exchange Name | NASDAQ |
| Common Class A [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Class A Common Stock |
| Trading Symbol | CENTA |
| Security Exchange Name | NASDAQ |
