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
Oct. 24, 2016
Oct. 21, 2016
Dec. 01, 2015
Jul. 31, 2015
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Sep. 27, 2014
Business Acquisition [Line Items]                
Goodwill         $ 256,275 $ 231,385 $ 209,089 $ 208,233
Segrest Inc.                
Business Acquisition [Line Items]                
Cash paid, net of cash acquired   $ 54,043            
Contingent consideration $ 6,000 2,700            
Cost of acquisition $ 60,000 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)          
IMS Trading Corp                
Business Acquisition [Line Items]                
Current assets, net of cash and cash equivalents acquired       $ 20,773        
Fixed assets       1,670        
Other assets       0        
Goodwill       1,365   $ 1,400    
Other intangible assets       4,510        
Current liabilities       (5,100)        
Net assets acquired, less cash and cash equivalents       23,218        
Measurement Period Adjustments                
Contingent consideration       834        
Current assets, net of cash and cash equivalents acquired       315        
Fixed assets       0        
Other assets       (5,356)        
Goodwill       1,365        
Other intangible assets       4,510        
Current liabilities       0        
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          
Amounts Previously Recognized as of Acquisition Date | IMS Trading Corp                
Business Acquisition [Line Items]                
Current assets, net of cash and cash equivalents acquired       20,458        
Fixed assets       1,670        
Other assets       5,356        
Goodwill       0        
Other intangible assets       0        
Current liabilities       (5,100)        
Net assets acquired, less cash and cash equivalents       $ 22,384