Segment Information - Financial Information Relating to Company's Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 24, 2022	Dec. 25, 2021	Sep. 24, 2022
Net sales:
Net sales	$ 627,663	$ 661,398
Operating income (loss)
Total operating income	406	26,214
Interest expense - net	(13,776)	(14,408)
Other income (expense)	1,699	(209)
Income tax (benefit) expense	(2,822)	2,401
Income (loss) including noncontrolling interest	(8,849)	9,196
Net income (loss) attributable to noncontrolling interest	(416)	187
Net income (loss) attributable to Central Garden & Pet Company	(8,433)	9,009
Depreciation and amortization:
Depreciation and amortization	21,692	20,202
Assets:
Total assets	3,229,069	3,118,041	$ 3,282,002
Goodwill (included in corporate assets above):
Total goodwill	546,436	369,391	546,436
Pet Segment
Net sales:
Net sales	415,820	436,002
Garden Segment
Net sales:
Net sales	211,843	225,396
Operating segments | Pet Segment
Operating income (loss)
Total operating income	39,555	45,251
Depreciation and amortization:
Depreciation and amortization	10,112	9,549
Assets:
Total assets	1,041,944	992,788	1,069,167
Goodwill (included in corporate assets above):
Total goodwill	277,067	277,067	277,067
Operating segments | Garden Segment
Operating income (loss)
Total operating income	(10,820)	6,057
Depreciation and amortization:
Depreciation and amortization	10,842	9,620
Assets:
Total assets	1,472,102	1,417,011	1,405,802
Goodwill (included in corporate assets above):
Total goodwill	269,369	92,324	269,369
Corporate
Operating income (loss)
Total operating income	(28,329)	(25,094)
Depreciation and amortization:
Depreciation and amortization	738	1,033
Assets:
Total assets	$ 715,023	$ 708,242	$ 807,033