Annual report pursuant to Section 13 and 15(d)

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

v3.5.0.2
Organization and Significant Accounting Policies - Additional Information 1 (Detail)
3 Months Ended 12 Months Ended
Sep. 24, 2016
USD ($)
Companies
Sep. 24, 2016
USD ($)
Companies
Sep. 26, 2015
USD ($)
Sep. 27, 2014
USD ($)
Dec. 30, 2014
New Accounting Pronouncement, Early Adoption [Line Items]          
Owned percentage in unconsolidated entities (as percent) 50.00% 50.00%      
Number of unconsolidated companies | Companies 4 4      
Equity income   $ 400,000 $ 400,000 $ 600,000  
Investment in unconsolidated companies $ 500,000 500,000 16,500,000    
Non-cash impairment charge 16,600,000 19,367,000 7,272,000 5,870,000  
Excess loss insurance that covers any health care claims   700,000      
Outstanding derivative instruments $ 0 0 0    
Stock-based compensation   8,356,000 8,315,000 7,678,000  
Stock-based compensation after tax   5,300,000 $ 5,300,000 $ 4,900,000  
Minimum [Member]          
New Accounting Pronouncement, Early Adoption [Line Items]          
General liability and vehicle liability insurance policies   250,000      
Maximum [Member]          
New Accounting Pronouncement, Early Adoption [Line Items]          
General liability and vehicle liability insurance policies   350,000      
Purishield LLC and Ceregenin LLC [Member]          
New Accounting Pronouncement, Early Adoption [Line Items]          
Owned percentage in unconsolidated entities (as percent)         50.00%
Non-cash impairment charge   $ 16,600,000