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Description of Business and Basis of Presentation (Revenues Realized from Each of These Types of Contracts) (Details) - Business
 3 Months Ended 12 Months Ended
Apr. 01, 2016
Sep. 30, 2016
Oct. 02, 2015
Sep. 26, 2014
Basis of Presentation [Line Items]        
Cost-reimbursable   82.00% 83.00% 83.00%
Fixed-price   18.00% 17.00% 17.00%
Number of operating and reporting structure of business 4      
Minimum        
Basis of Presentation [Line Items]        
Frequency of fiscal year with an additional week of activity (in years)   5 years    
Maximum        
Basis of Presentation [Line Items]        
Frequency of fiscal year with an additional week of activity (in years)   6 years