Receivables (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable
Maximum Amount of Receivables That May Be Sold to Purchasers	$ 125,000
Total Receivables Sold Under RPA	680,709
Total Cash Collections Under RPA	680,709
Gain Loss on Sale of Receivables	0
Amount of Receivables Sold to Purchasers	125,000
Program 1
Accounts, Notes, Loans and Financing Receivable
Refundable Tax Credit Maximum	8,500
Program 2
Accounts, Notes, Loans and Financing Receivable
Refundable Tax Credit Maximum	$ 16,400
Cares Act Receivable
Accounts, Notes, Loans and Financing Receivable
Refundable Tax Credit Claimable As Percentage of Qualified Wages	70.00%
Accounts Receivable
Accounts, Notes, Loans and Financing Receivable
Government assistance receivables	$ 5,643	$ 16,673
Accounts Receivable | Cares Act Receivable
Accounts, Notes, Loans and Financing Receivable
Contra Expense Recorded as Government Assistance Receivable	$ 3,320
Accounts Receivable | Excelsior Jobs Program Receivable
Accounts, Notes, Loans and Financing Receivable
Contra Expense Income Statement Location of Government Assistance Receivable	Receivables, net, Cost of Product and Service Sold	Receivables, net, Cost of Product and Service Sold	Receivables, net, Cost of Product and Service Sold
Future Tax Credits	$ 15,289
Accounts Receivable | Excelsior Jobs Program Receivable | Program 1
Accounts, Notes, Loans and Financing Receivable
Contra Expense Recorded as Government Assistance Receivable	1,956	$ 1,118	$ 1,118
Government assistance receivables	3,074	2,236
Accounts Receivable | Excelsior Jobs Program Receivable | Program 2
Accounts, Notes, Loans and Financing Receivable
Contra Expense Recorded as Government Assistance Receivable	2,509
Government assistance receivables	2,509
Accounts Receivable | Cost of sales | Cares Act Receivable
Accounts, Notes, Loans and Financing Receivable
Contra Expense Recorded as Government Assistance Receivable	$ 3,084	$ 13,247
Contra Expense Income Statement Location of Government Assistance Receivable	Receivables, net, Cost of Product and Service Sold	Receivables, net, Cost of Product and Service Sold
Accounts Receivable | Selling, General and Administrative Expenses | Cares Act Receivable
Accounts, Notes, Loans and Financing Receivable
Contra Expense Recorded as Government Assistance Receivable	$ 236	$ 1,012
Contra Expense Income Statement Location of Government Assistance Receivable	Receivables, net, Selling, General and Administrative Expense	Receivables, net, Selling, General and Administrative Expense
Asset Pledged as Collateral
Accounts, Notes, Loans and Financing Receivable
Receivables, net	$ 668,021
United States
Accounts, Notes, Loans and Financing Receivable
Amounts billed for over-time contract receivable to US Government	1,668	$ 3,952
Boeing
Accounts, Notes, Loans and Financing Receivable
Receivables from customers	263,140	242,096
Lockheed Martin
Accounts, Notes, Loans and Financing Receivable
Receivables from customers	$ 138,246	$ 122,816