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Acquisitions and Investments in Joint Ventures - Additional Information (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 01, 2015
USD ($)
Sep. 30, 2015
USD ($)
Dec. 30, 2014
USD ($)
JointVenture
Sep. 24, 2016
USD ($)
JointVenture
Sep. 24, 2016
USD ($)
JointVenture
Sep. 26, 2015
USD ($)
Jul. 31, 2015
USD ($)
Sep. 27, 2014
USD ($)
Apr. 01, 2014
USD ($)
Sep. 28, 2013
USD ($)
Business Acquisition [Line Items]                    
Excess of purchase price included in goodwill       $ 231,385 $ 231,385 $ 209,089   $ 208,233   $ 205,756
Percentage of equity interest in joint venture       50.00% 50.00%          
Number of joint ventures | JointVenture       2 2          
Purishield LLC and Ceregenin LLC [Member]                    
Business Acquisition [Line Items]                    
Investment in joint ventures     $ 16,000              
Percentage of equity interest in joint venture     50.00%              
Number of joint ventures | JointVenture     2              
Hydro Organics Wholesale Inc [Member]                    
Business Acquisition [Line Items]                    
Payments to acquire businesses   $ 7,800                
Purchase price in excess of fair value   10,700                
Excess of purchase price included in intangible assets   5,200                
Excess of purchase price included in goodwill   5,500                
Hydro Organics Wholesale Inc [Member] | Future Performance [Member]                    
Business Acquisition [Line Items]                    
Estimated contingent future performance-based payments   $ 2,600                
DMC [Member]                    
Business Acquisition [Line Items]                    
Purchase price in excess of fair value $ 33,800                  
Excess of purchase price included in intangible assets 18,700                  
Excess of purchase price included in goodwill 15,058                  
Cost of acquisition $ 61,000                  
DMC and IMS Trading Corp [Member]                    
Business Acquisition [Line Items]                    
Impact of acquisitions on the Company's operating income         $ 10,600          
IMS Trading Corp [Member]                    
Business Acquisition [Line Items]                    
Excess of purchase price included in intangible assets             $ 4,510      
Excess of purchase price included in goodwill       $ 1,400 $ 1,400   1,365      
Purchase of certain assets             $ 23,200      
Envincio, LLC [Member]                    
Business Acquisition [Line Items]                    
Excess of purchase price included in intangible assets                 $ 11,450  
Excess of purchase price included in goodwill                 3,333  
Purchase of certain assets                 $ 20,300  
Other Nonoperating Income (Expense) [Member] | Purishield LLC and Ceregenin LLC [Member]                    
Business Acquisition [Line Items]                    
Non-cash impairment charge       $ 16,600