Annual report pursuant to Section 13 and 15(d)

Acquisitions and Investments in Joint Ventures - Summary of Recording of Fair Values of Assets Acquired and Liabilities Assumed (Detail)

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Acquisitions and Investments in Joint Ventures - Summary of Recording of Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Apr. 02, 2018
Mar. 12, 2018
Apr. 28, 2017
Oct. 21, 2016
Dec. 01, 2015
Sep. 29, 2018
Sep. 30, 2017
Sep. 24, 2016
Sep. 27, 2014
Business Acquisition [Line Items]                  
Goodwill           $ 281,177 $ 256,275 $ 231,385 $ 209,089
General Pet Supply                  
Business Acquisition [Line Items]                  
Current assets, net of cash and cash equivalents acquired $ 12,991                
Fixed assets 1,530                
Other assets 11                
Goodwill 5,520         $ 5,500      
Other intangible assets 8,100                
Current liabilities (3,506)                
Long-term obligations (361)                
Net assets acquired, less cash and cash equivalents 24,285                
Measurement Period Adjustments                  
Current assets, net of cash and cash equivalents acquired 0                
Fixed assets 516                
Other assets (14,136)                
Goodwill 5,520                
Other intangible assets 8,100                
Current liabilities 0                
Long-term obligations                
Net assets acquired, less cash and cash equivalents 0                
Bell Nursery                  
Business Acquisition [Line Items]                  
Contingent consideration   $ 10,000              
Current assets, net of cash and cash equivalents acquired   27,971 $ 6,052            
Fixed assets   30,661 315            
Other assets   0 11,968            
Goodwill   7,415 0            
Other intangible assets   6,230 29,200            
Current liabilities   (13,633) (757)            
Net assets acquired, less cash and cash equivalents   58,644 46,778            
Measurement Period Adjustments                  
Current assets, net of cash and cash equivalents acquired   (359) 613            
Fixed assets   383 0            
Other assets   (11,647) 11,968            
Goodwill   7,415 (41,781)            
Other intangible assets   6,230 29,200            
Current liabilities   (2,022) 0            
Net assets acquired, less cash and cash equivalents   0 0            
Segrest Inc.                  
Business Acquisition [Line Items]                  
Cash paid, net of cash acquired       $ 54,043          
Contingent consideration       2,700          
Cost of acquisition       56,743          
Current assets, net of cash and cash equivalents acquired       7,103          
Fixed assets       9,253          
Other assets       0          
Goodwill       25,890          
Other intangible assets       27,650          
Current liabilities       (2,075)          
Deferred Tax Liability       (11,078)          
Net assets acquired, less cash and cash equivalents       56,743          
Measurement Period Adjustments                  
Contingent consideration       (3,300)          
Current assets, net of cash and cash equivalents acquired       (300)          
Fixed assets       2,242          
Other assets       (47,704)          
Goodwill       25,890          
Other intangible assets       27,650          
Deferred Tax Liability       (11,078)          
Net assets acquired, less cash and cash equivalents       (3,300)          
DMC                  
Business Acquisition [Line Items]                  
Cost of acquisition         $ 61,000        
Current assets, net of cash and cash equivalents acquired         41,326        
Fixed assets         538        
Other assets         20        
Goodwill         15,058   $ 15,100    
Other intangible assets         18,700        
Current liabilities         (14,626)        
Net assets acquired, less cash and cash equivalents         61,016        
Measurement Period Adjustments                  
Contingent consideration         101        
Current assets, net of cash and cash equivalents acquired         156        
Fixed assets         17        
Other assets         (33,790)        
Goodwill         15,058        
Other intangible assets         18,700        
Current liabilities         (40)        
Amounts Previously Recognized as of Acquisition Date | General Pet Supply                  
Business Acquisition [Line Items]                  
Current assets, net of cash and cash equivalents acquired 12,991                
Fixed assets 1,014                
Other assets 14,147                
Goodwill 0                
Other intangible assets 0                
Current liabilities (3,506)                
Long-term obligations (361)                
Net assets acquired, less cash and cash equivalents $ 24,285                
Amounts Previously Recognized as of Acquisition Date | Bell Nursery                  
Business Acquisition [Line Items]                  
Current assets, net of cash and cash equivalents acquired   28,330 5,439            
Fixed assets   30,278 315            
Other assets   11,647 0            
Goodwill   0 41,781            
Other intangible assets   0 0            
Current liabilities   (11,611) (757)            
Net assets acquired, less cash and cash equivalents   $ 58,644 $ 46,778            
Amounts Previously Recognized as of Acquisition Date | Segrest Inc.                  
Business Acquisition [Line Items]                  
Cash paid, net of cash acquired       54,043          
Contingent consideration       6,000          
Cost of acquisition       60,043          
Current assets, net of cash and cash equivalents acquired       7,403          
Fixed assets       7,011          
Other assets       47,704          
Current liabilities       (2,075)          
Net assets acquired, less cash and cash equivalents       $ 60,043          
Amounts Previously Recognized as of Acquisition Date | DMC                  
Business Acquisition [Line Items]                  
Current assets, net of cash and cash equivalents acquired         41,170        
Fixed assets         521        
Other assets         33,810        
Goodwill         0        
Other intangible assets         0        
Current liabilities         (14,586)        
Net assets acquired, less cash and cash equivalents         $ 60,915