Goodwill - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 25, 2021	Sep. 26, 2020
Goodwill [Roll Forward]
Goodwill	$ 955,997	$ 955,997	$ 778,952	$ 699,516
Accumulated impairment losses	(409,561)	(409,561)	(409,561)	(409,561)
Balance as of beginning of period	546,436	369,391	289,955
Additions in fiscal year	0	177,045	79,436
Balance as of end of period	546,436	546,436	369,391
Garden Products Segment
Goodwill [Roll Forward]
Goodwill	482,952	482,952	305,907	226,471
Accumulated impairment losses	(213,583)	(213,583)	(213,583)	(213,583)
Balance as of beginning of period	269,369	92,324	12,888
Additions in fiscal year	0	177,045	79,436
Balance as of end of period	269,369	269,369	92,324
Pet Products Segment
Goodwill [Roll Forward]
Goodwill	473,045	473,045	473,045	473,045
Accumulated impairment losses	(195,978)	(195,978)	(195,978)	$ (195,978)
Balance as of beginning of period	277,067	277,067	277,067
Additions in fiscal year	0	0	0
Balance as of end of period	$ 277,067	$ 277,067	$ 277,067