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Description of Business and Basis of Presentation (Tables)
12 Months Ended
Sep. 27, 2019
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 27, 2019, September 28, 2018 and September 29, 2017 was as follows:
 
For the Years Ended
 
September 27, 2019
 
September 28, 2018
 
September 29, 2017
Cost-reimbursable
76
%
 
74
%

76
%
Fixed-price
24
%
 
26
%

24
%