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