Segment Information - Financial Information Relating to Company's Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Sep. 28, 2024
Net sales:
Net sales	$ 656,436	$ 634,533
Operating income (loss)
Total operating income	27,992	8,412
Interest expense - net	(7,730)	(9,707)
Other income (expense)	(1,717)	993
Income tax expense (benefit)	4,364	(869)
Income including noncontrolling interest	14,181	567
Net income attributable to noncontrolling interest	172	137
Net income attributable to Central Garden & Pet Company	14,009	430
Depreciation and amortization:
Depreciation and amortization	21,934	22,545
Assets:
Total assets	3,535,855	3,422,334	$ 3,553,439
Goodwill (included in corporate assets above):
Total goodwill	551,361	546,436	551,361
Pet Segment
Net sales:
Net sales	427,462	409,222
Garden Segment
Net sales:
Net sales	228,974	225,311
Operating segments
Net sales:
Net sales	656,400	634,500
Operating segments | Pet Segment
Net sales:
Net sales	427,500	409,200
Operating income (loss)
Total operating income	51,257	43,388
Depreciation and amortization:
Depreciation and amortization	10,080	10,798
Assets:
Total assets	970,020	1,010,988	955,000
Goodwill (included in corporate assets above):
Total goodwill	281,992	277,067	281,992
Operating segments | Garden Segment
Net sales:
Net sales	228,900	225,300
Operating income (loss)
Total operating income	2,423	(8,886)
Depreciation and amortization:
Depreciation and amortization	11,131	11,006
Assets:
Total assets	1,370,229	1,432,258	1,272,033
Goodwill (included in corporate assets above):
Total goodwill	269,369	269,369	269,369
Corporate
Operating income (loss)
Total operating income	(25,688)	(26,090)
Depreciation and amortization:
Depreciation and amortization	723	741
Assets:
Total assets	$ 1,195,606	$ 979,088	$ 1,326,406