Segment Information - Disaggregated Revenues by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2026	Mar. 29, 2025	Mar. 28, 2026	Mar. 29, 2025
Segment Reporting Information [Line Items]
Total	$ 906,152	$ 833,537	$ 1,523,525	$ 1,489,973
Operating Segments
Segment Reporting Information [Line Items]
Total	906,100	833,500	1,523,500	1,490,000
Pet | Operating Segments
Segment Reporting Information [Line Items]
Total	476,800	453,700	892,600	881,200
Garden | Operating Segments
Segment Reporting Information [Line Items]
Total	429,300	379,800	630,900	608,800
Other pet products | Operating Segments
Segment Reporting Information [Line Items]
Total	164,000	152,900	282,700	277,800
Other pet products | Pet | Operating Segments
Segment Reporting Information [Line Items]
Total	164,000	152,900	282,700	277,800
Other pet products | Garden | Operating Segments
Segment Reporting Information [Line Items]
Total	0	0	0	0
Dog and cat products | Operating Segments
Segment Reporting Information [Line Items]
Total	157,400	137,400	314,400	298,100
Dog and cat products | Pet | Operating Segments
Segment Reporting Information [Line Items]
Total	157,400	137,400	314,400	298,100
Dog and cat products | Garden | Operating Segments
Segment Reporting Information [Line Items]
Total	0	0	0	0
Other manufacturers' products | Operating Segments
Segment Reporting Information [Line Items]
Total	168,500	171,200	306,500	318,500
Other manufacturers' products | Pet | Operating Segments
Segment Reporting Information [Line Items]
Total	104,400	110,300	206,800	215,300
Other manufacturers' products | Garden | Operating Segments
Segment Reporting Information [Line Items]
Total	64,100	60,900	99,700	103,200
Wild bird products | Operating Segments
Segment Reporting Information [Line Items]
Total	135,300	134,800	229,200	225,300
Wild bird products | Pet | Operating Segments
Segment Reporting Information [Line Items]
Total	51,000	53,100	88,700	90,000
Wild bird products | Garden | Operating Segments
Segment Reporting Information [Line Items]
Total	84,300	81,700	140,500	135,300
Other garden supplies | Operating Segments
Segment Reporting Information [Line Items]
Total	280,900	237,200	390,700	370,300
Other garden supplies | Pet | Operating Segments
Segment Reporting Information [Line Items]
Total	0	0	0	0
Other garden supplies | Garden | Operating Segments
Segment Reporting Information [Line Items]
Total	$ 280,900	$ 237,200	$ 390,700	$ 370,300