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Description of Business and Basis of Presentation - Schedule of Revenues Realized from Each of These Types of Contracts (Details)	12 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cost-reimbursable	69.00%	70.00%	71.00%
Fixed-price	31.00%	30.00%	29.00%

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- Definition

Revenue From Cost Reimbursable Contracts Percentage

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- Definition

Revenue From Fixed Price Contracts Percentage

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