Business Segment Data - Financial Information Relating to Company's Business Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 25, 2021
Net sales:
Revenues	$ 3,310,083	$ 3,338,588	$ 3,303,684
Operating income (loss):
Operating income (loss)	210,646	260,036	254,496
Interest expense	(57,025)	(58,253)	(58,597)
Interest income	7,362	719	415
Other expense, net	1,462	(3,596)	(1,506)
Income before income taxes and noncontrolling interest	162,445	198,906	194,808
Income tax expense	36,348	46,234	42,035
Net income including noncontrolling interest	126,097	152,672	152,773
Net income attributable to noncontrolling interest	454	520	1,027
Net Income (Loss) Attributable to Parent	125,643	152,152	151,746
Assets:
Assets	3,378,648	3,282,002	3,116,680
Depreciation and amortization:
Depreciation and amortization	87,700	80,948	74,727
Expenditures for long-lived assets:
Expenditures for long-lived assets	53,966	115,205	80,333
Operating Segments | Pet segment
Net sales:
Revenues	1,877,177	1,878,110	1,894,929
Operating income (loss):
Operating income (loss)	198,004	208,924	208,201
Assets:
Assets	944,359	1,069,167	966,437
Depreciation and amortization:
Depreciation and amortization	41,126	38,960	36,952
Expenditures for long-lived assets:
Expenditures for long-lived assets	33,515	46,917	44,919
Operating Segments | Garden segment
Net sales:
Revenues	1,432,906	1,460,478	1,408,755
Operating income (loss):
Operating income (loss)	123,455	153,956	138,755
Assets:
Assets	1,349,426	1,405,802	1,313,899
Depreciation and amortization:
Depreciation and amortization	43,375	36,583	33,050
Expenditures for long-lived assets:
Expenditures for long-lived assets	19,109	65,126	34,043
Corporate and eliminations
Operating income (loss):
Operating income (loss)	(110,813)	(102,844)	(92,460)
Assets:
Assets	1,084,863	807,033	836,344
Depreciation and amortization:
Depreciation and amortization	3,199	5,405	4,725
Expenditures for long-lived assets:
Expenditures for long-lived assets	$ 1,342	$ 3,162	$ 1,371