Annual report pursuant to Section 13 and 15(d)

Business Segment Data - Class of Similar Products Which Represented More than 10% of Company's Consolidated Net Sales (Detail)

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Business Segment Data - Class of Similar Products Which Represented More than 10% of Company's Consolidated Net Sales (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 28, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 29, 2012
Sep. 27, 2014
Sep. 28, 2013
Sep. 29, 2012
Revenue from External Customer [Line Items]                      
Net sales $ 374,238 $ 437,987 $ 501,611 $ 290,521 $ 368,837 $ 494,130 $ 498,169 $ 292,497 $ 1,604,357 $ 1,653,633 $ 1,700,013
Pet supplies (excluding wild bird feed) [Member]
                     
Revenue from External Customer [Line Items]                      
Net sales                 774,200 807,400 847,100
Garden controls and fertilizer products [Member]
                     
Revenue from External Customer [Line Items]                      
Net sales                 262,500 274,900 281,700
Wild bird feed [Member]
                     
Revenue from External Customer [Line Items]                      
Net sales                 202,100 210,800 205,100
Other garden supplies [Member]
                     
Revenue from External Customer [Line Items]                      
Net sales                 182,500 183,500 185,700
Grass seed [Member]
                     
Revenue from External Customer [Line Items]                      
Net sales                 $ 183,100 $ 177,000 $ 180,400