Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Business Segment Data - Class of Similar Products Which Represented Approximately 10% or More of Company's Consolidated Net Sales (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 26, 2015
Jun. 27, 2015
Mar. 28, 2015
Dec. 27, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 28, 2013
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Revenue from External Customer [Line Items]                      
Net sales $ 386,369 $ 459,446 $ 497,602 $ 307,320 $ 374,238 $ 437,987 $ 501,611 $ 290,521 $ 1,650,737 $ 1,604,357 $ 1,653,633
Pet supplies (excluding wild bird feed) [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 827,700 774,200 807,400
Garden controls and fertilizer products [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 286,300 262,500 274,900
Wild bird feed [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 193,200 202,100 210,800
Other garden supplies [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 181,400 182,500 183,500
Grass seed [Member]                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 162,100 $ 183,100 $ 177,000