Guarantees, Commitments and Contingencies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows - operating leases	$ 2,227	$ 2,442
Operating cash flows - finance leases	13	40
Financing cash flows - finance leases	981	589	$ 570
Right-of-use assets exchanged for lease liabilities
Operating leases	$ 3,327	$ 1,682	$ 626