Annual report pursuant to Section 13 and 15(d)

Organization and Significant Accounting Policies - Additional Information 1 (Detail)

v3.8.0.1
Organization and Significant Accounting Policies - Additional Information 1 (Detail)
 3 Months Ended 12 Months Ended
Sep. 24, 2016
USD ($)
Sep. 30, 2017
USD ($)
Companies
Sep. 24, 2016
USD ($)
Sep. 26, 2015
USD ($)
Dec. 30, 2014
New Accounting Pronouncement, Early Adoption [Line Items]          
Number of unconsolidated companies | Companies   6      
Equity income (loss)   $ (900,000) $ 400,000 $ 400,000  
Investment in unconsolidated companies $ 500,000 9,200,000 500,000    
Excess loss insurance that covers any health care claims   700,000      
Stock-based compensation   11,115,000 8,356,000 8,315,000  
Stock-based compensation after tax   7,000,000 5,300,000 $ 5,300,000  
Current deferred tax assets reclassified as non-current 31,500,000   31,500,000    
Restricted cash 10,910,000 $ 12,645,000 10,910,000    
Minimum          
New Accounting Pronouncement, Early Adoption [Line Items]          
Owned percentage in unconsolidated entities (as percent)   30.00%      
General liability and vehicle liability insurance policies   $ 250,000      
Maximum          
New Accounting Pronouncement, Early Adoption [Line Items]          
Owned percentage in unconsolidated entities (as percent)   50.00%      
General liability and vehicle liability insurance policies   $ 350,000      
Purishield LLC and Ceregenin LLC          
New Accounting Pronouncement, Early Adoption [Line Items]          
Owned percentage in unconsolidated entities (as percent)         50.00%
Other income (expense)          
New Accounting Pronouncement, Early Adoption [Line Items]          
Non-cash impairment charge $ 16,600,000        
Other income (expense) | Purishield LLC and Ceregenin LLC          
New Accounting Pronouncement, Early Adoption [Line Items]          
Non-cash impairment charge     $ 16,600,000