Segment Information - Disaggregated Revenues by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 24, 2022	Dec. 25, 2021
Segment Reporting Information [Line Items]
Revenues	$ 627,663	$ 661,398
Pet Segment
Segment Reporting Information [Line Items]
Revenues	415,820	436,002
Garden Segment
Segment Reporting Information [Line Items]
Revenues	211,843	225,396
Other pet products
Segment Reporting Information [Line Items]
Revenues	139,500	153,600
Other pet products | Pet Segment
Segment Reporting Information [Line Items]
Revenues	139,500	153,600
Other pet products | Garden Segment
Segment Reporting Information [Line Items]
Revenues	0	0
Dog and cat products
Segment Reporting Information [Line Items]
Revenues	134,200	144,900
Dog and cat products | Pet Segment
Segment Reporting Information [Line Items]
Revenues	134,200	144,900
Dog and cat products | Garden Segment
Segment Reporting Information [Line Items]
Revenues	0	0
Other manufacturers' products
Segment Reporting Information [Line Items]
Revenues	149,400	153,900
Other manufacturers' products | Pet Segment
Segment Reporting Information [Line Items]
Revenues	103,400	104,500
Other manufacturers' products | Garden Segment
Segment Reporting Information [Line Items]
Revenues	46,000	49,400
Wild bird products
Segment Reporting Information [Line Items]
Revenues	98,300	87,700
Wild bird products | Pet Segment
Segment Reporting Information [Line Items]
Revenues	38,700	33,000
Wild bird products | Garden Segment
Segment Reporting Information [Line Items]
Revenues	59,500	54,700
Other garden supplies
Segment Reporting Information [Line Items]
Revenues	106,300	121,300
Other garden supplies | Pet Segment
Segment Reporting Information [Line Items]
Revenues	0	0
Other garden supplies | Garden Segment
Segment Reporting Information [Line Items]
Revenues	$ 106,300	$ 121,300