Segment Information - Financial Information Relating to Company's Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 24, 2023	Jun. 25, 2022	Jun. 24, 2023	Jun. 25, 2022	Sep. 24, 2022
Net sales:
Net sales	$ 1,023,269	$ 1,015,378	$ 2,559,936	$ 2,631,146
Operating income (loss)
Total operating income	122,830	114,079	201,277	247,138
Interest expense - net	(13,134)	(14,335)	(41,600)	(43,445)
Other income (expense)	853	(759)	3,147	(1,337)
Income tax expense	27,000	23,430	39,446	47,319
Income including noncontrolling interest	83,549	75,555	123,378	155,037
Net income attributable to noncontrolling interest	423	135	570	895
Net income attributable to Central Garden & Pet Company	83,126	75,420	122,808	154,142
Depreciation and amortization:
Depreciation and amortization	21,701	19,884	65,504	58,333
Assets:
Total assets	3,419,947	3,345,926	3,419,947	3,345,926	$ 3,282,002
Goodwill (included in corporate assets above):
Total goodwill	546,436	511,973	546,436	511,973	546,436
Pet Segment
Net sales:
Net sales	503,329	504,781	1,394,352	1,438,423
Garden Segment
Net sales:
Net sales	519,940	510,597	1,165,584	1,192,723
Operating segments | Pet Segment
Operating income (loss)
Total operating income	59,969	62,616	154,779	168,512
Depreciation and amortization:
Depreciation and amortization	10,060	9,791	30,647	28,879
Assets:
Total assets	1,009,606	1,098,886	1,009,606	1,098,886	1,069,167
Goodwill (included in corporate assets above):
Total goodwill	277,067	277,067	277,067	277,067	277,067
Operating segments | Garden Segment
Operating income (loss)
Total operating income	88,088	75,564	126,887	152,132
Depreciation and amortization:
Depreciation and amortization	10,823	9,118	32,483	26,457
Assets:
Total assets	1,473,774	1,498,856	1,473,774	1,498,856	1,405,802
Goodwill (included in corporate assets above):
Total goodwill	269,369	234,906	269,369	234,906	269,369
Corporate
Operating income (loss)
Total operating income	(25,227)	(24,101)	(80,389)	(73,506)
Depreciation and amortization:
Depreciation and amortization	818	975	2,374	2,997
Assets:
Total assets	$ 936,567	$ 748,184	$ 936,567	$ 748,184	$ 807,033