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Acquisitions and Divestitures - Pro Forma Information (Details) - Green Garden Products - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 26, 2021 | Jun. 27, 2020 | Jun. 26, 2021 | Jun. 27, 2020
Business Acquisition [Line Items] |  |  |  |
Net sales | $ 1,037,075 | $ 903,166 | $ 2,618,850 | $ 2,155,753
Net income attributable to Central Garden & Pet Company | $ 76,186 | $ 89,780 | $ 178,515 | $ 133,471
Diluted net income per share attributable to Central Garden & Pet Company (in dollars per share) | $ 1.37 | $ 1.66 | $ 3.23 | $ 2.43

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