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Acquisitions and Divestitures - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Feb. 11, 2021 | Dec. 31, 2020 | Dec. 26, 2020 | Mar. 27, 2021 | Dec. 26, 2020 | Mar. 28, 2020 | Mar. 27, 2021 | Mar. 28, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Amount borrowed to partially finance acquisition |  |  |  |  |  |  | $ 830,000 | $ 0
Net sales |  |  |  | $ 935,252 |  | $ 703,229 | 1,527,482 | 1,186,057
Net income |  |  |  | 645 |  | 438 | 674 | 316
Loss on sale of business |  |  |  |  |  |  | 2,611 | 0
Net income |  |  |  | $ 73,599 |  | $ 43,142 | $ 79,241 | $ 38,603
Diluted (in dollars per share) |  |  |  | $ 1.32 |  | $ 0.78 | $ 1.43 | $ 0.69
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Breeders Choice |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash proceeds |  |  | $ 2,400 |  |  |  |  |
Disposal group, current and long-term net assets |  |  | 4,700 |  | $ 4,700 |  |  |
Loss on sale of business |  |  |  |  | 2,600 |  |  |
DoMyOwn |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payments to acquire business |  |  | 81,000 |  |  |  |  |
Business acquisition, other assets |  |  | $ 80,000 |  | $ 80,000 |  |  |
Hopewell Nursery |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payments to acquire business |  | $ 81,000 |  |  |  |  |  |
Business acquisition, other assets |  | $ 17,000 |  |  |  |  |  |
Green Garden Products |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payments to acquire business | $ 571,000 |  |  |  |  |  |  |
Business acquisition, other assets | 490,000 |  |  |  |  |  |  |
Amount borrowed to partially finance acquisition | $ 180,000 |  |  |  |  |  |  |
Net sales |  |  |  | $ 55,000 |  |  | $ 55,000 |
Net income |  |  |  | $ 5,000 |  |  | $ 5,000 |

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