Business Segment Data - Financial Information Relating to Company's Business Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	$ 3,129,100	$ 3,200,500	$ 3,310,100
Cost of goods sold	2,131,728	2,256,725	2,363,241
Selling, general and administrative expenses	747,294	758,348	736,196
Segment operating income	250,042	185,387	210,646
Interest expense	(57,697)	(57,527)	(57,025)
Interest income	24,885	19,655	7,362
Other expense	(480)	(5,090)	1,462
Income before income taxes and noncontrolling interest	216,750	142,425	162,445
Assets:
Assets	3,625,643	3,553,439	3,378,648
Depreciation and amortization:
Depreciation and amortization	84,894	90,807	87,700
Expenditures for long-lived assets:
Expenditures for long-lived assets	41,606	46,664	53,966
Operating Segments
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	3,129,064	3,200,460	3,310,083
Segment operating income	358,090	285,318	321,460
Assets:
Assets	2,173,210	2,227,033	2,293,785
Depreciation and amortization:
Depreciation and amortization	82,217	88,045	84,501
Expenditures for long-lived assets:
Expenditures for long-lived assets	40,844	45,064	52,624
Operating Segments | Pet
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	1,801,930	1,832,744	1,877,177
Cost of goods sold	1,164,117	1,203,255	1,280,333
Selling, general and administrative expenses	422,125	426,064	398,839
Segment operating income	215,688	203,425	198,005
Assets:
Assets	941,122	955,000	944,359
Depreciation and amortization:
Depreciation and amortization	39,916	43,642	41,126
Expenditures for long-lived assets:
Expenditures for long-lived assets	26,189	27,757	33,515
Operating Segments | Garden
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues	1,327,134	1,367,716	1,432,906
Cost of goods sold	967,611	1,053,470	1,082,908
Selling, general and administrative expenses	217,121	232,353	226,543
Segment operating income	142,402	81,893	123,455
Assets:
Assets	1,232,088	1,272,033	1,349,426
Depreciation and amortization:
Depreciation and amortization	42,301	44,403	43,375
Expenditures for long-lived assets:
Expenditures for long-lived assets	14,655	17,307	19,109
Unallocated corporate expenses
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Unallocated corporate expenses	(108,048)	(99,931)	(110,814)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Interest expense	(57,697)	(57,527)	(57,025)
Interest income	24,885	19,655	7,362
Other expense	(480)	(5,090)	1,462
Corporate and unallocated
Assets:
Assets	1,452,433	1,326,406	1,084,863
Depreciation and amortization:
Depreciation and amortization	2,677	2,762	3,199
Expenditures for long-lived assets:
Expenditures for long-lived assets	$ 762	$ 1,600	$ 1,342