Segment Information - Disaggregated Revenues by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2023	Dec. 24, 2022
Segment Reporting Information [Line Items]
Revenues	$ 634,533	$ 627,663
Pet Segment
Segment Reporting Information [Line Items]
Revenues	409,222	415,820
Garden Segment
Segment Reporting Information [Line Items]
Revenues	225,311	211,843
Other pet products
Segment Reporting Information [Line Items]
Revenues	127,700	139,500
Other pet products | Pet Segment
Segment Reporting Information [Line Items]
Revenues	127,700	139,500
Other pet products | Garden Segment
Segment Reporting Information [Line Items]
Revenues	0	0
Dog and cat products
Segment Reporting Information [Line Items]
Revenues	145,300	134,200
Dog and cat products | Pet Segment
Segment Reporting Information [Line Items]
Revenues	145,300	134,200
Dog and cat products | Garden Segment
Segment Reporting Information [Line Items]
Revenues	0	0
Other manufacturers' products
Segment Reporting Information [Line Items]
Revenues	146,900	149,400
Other manufacturers' products | Pet Segment
Segment Reporting Information [Line Items]
Revenues	100,300	103,400
Other manufacturers' products | Garden Segment
Segment Reporting Information [Line Items]
Revenues	46,600	46,000
Wild bird products
Segment Reporting Information [Line Items]
Revenues	86,700	98,300
Wild bird products | Pet Segment
Segment Reporting Information [Line Items]
Revenues	35,900	38,700
Wild bird products | Garden Segment
Segment Reporting Information [Line Items]
Revenues	50,800	59,500
Other garden supplies
Segment Reporting Information [Line Items]
Revenues	127,900	106,300
Other garden supplies | Pet Segment
Segment Reporting Information [Line Items]
Revenues	0	0
Other garden supplies | Garden Segment
Segment Reporting Information [Line Items]
Revenues	$ 127,900	$ 106,300