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Description of Business and Basis of Presentation (Tables)
 12 Months Ended
Oct. 02, 2020
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 October 2, 2020, September 27, 2019 and September 28, 2018 was as follows:
 For the Years Ended
 October 2, 2020September 27, 2019 September 28, 2018
Cost-reimbursable76%76%74%
Fixed-price24%24%26%