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)

v3.10.0.1
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. 30, 2017
Jun. 24, 2017
Mar. 25, 2017
Dec. 24, 2016
Sep. 24, 2016
Jun. 25, 2016
Mar. 26, 2016
Dec. 26, 2015
Sep. 29, 2018
Sep. 30, 2017
Sep. 24, 2016
Revenue from External Customer [Line Items]                      
Net sales $ 502,314 $ 657,943 $ 613,094 $ 442,011 $ 490,464 $ 574,592 $ 569,924 $ 419,498 $ 2,215,362 $ 2,054,478 $ 1,829,017
Other pet products                      
Revenue from External Customer [Line Items]                      
Net sales                 896,500 841,400 689,300
Other garden supplies                      
Revenue from External Customer [Line Items]                      
Net sales                 528,800 464,900 331,300
Dog and cat products                      
Revenue from External Customer [Line Items]                      
Net sales                 444,400 405,000 326,000
Garden controls and fertilizer products                      
Revenue from External Customer [Line Items]                      
Net sales                 345,700 343,200 298,800
Wild bird feed                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 0 $ 0 $ 183,600