Goodwill - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 28, 2013	Sep. 28, 2013	Sep. 29, 2012	Sep. 24, 2011	Sep. 25, 2010
Goodwill [Line Items]
Additions in fiscal year		$ 3,242		$ 2,904
Impairment losses in fiscal year	(7,709)	(7,709)	0	0
Goodwill	615,317	615,317	612,075	612,075	609,171
Accumulated impairment losses	(409,561)	(409,561)	(401,852)	(401,852)	(401,852)
Total goodwill	205,756	205,756	210,223	210,223	207,319
Garden Products Segment [Member]
Goodwill [Line Items]
Additions in fiscal year		0		2,029
Impairment losses in fiscal year		(7,709)
Goodwill	213,583	213,583	213,583	213,583	211,554
Accumulated impairment losses	(213,583)	(213,583)	(205,874)	(205,874)	(205,874)
Total goodwill	0	0	7,709	7,709	5,680
Pet Products Segment [Member]
Goodwill [Line Items]
Additions in fiscal year		3,242		875
Impairment losses in fiscal year		0
Goodwill	401,734	401,734	398,492	398,492	397,617
Accumulated impairment losses	(195,978)	(195,978)	(195,978)	(195,978)	(195,978)
Total goodwill	$ 205,756	$ 205,756	$ 202,514	$ 202,514	$ 201,639