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Description of Business and Basis of Presentation (Tables)
12 Months Ended
Sep. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Revenues Realized from Each of These Types of Contracts
The percentage of revenues realized from each of these types of contracts for the fiscal years ended September 28, 2018, September 29, 2017 and September 30, 2016 was as follows:
 
For the Years Ended
 
September 28, 2018
 
September 29, 2017
 
September 30, 2016
Cost-reimbursable
76
%
 
81
%
 
82
%
Fixed-price
24
%
 
19
%
 
18
%