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Acquisitions and Investments in Joint Ventures - Green Garden Products - Pro Forma Information (Details) - Green Garden Products - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Sep. 25, 2021 | Sep. 26, 2020
Business Acquisition [Line Items] |  |
Net sales | $ 3,357,977 | $ 2,850,678
Net income attributable to Central Garden & Pet Company | $ 175,508 | $ 146,277
Diluted net income per share attributable to Central Garden & Pet Company | $ 3.18 | $ 2.67

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