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Debt (Details) - USD ($) $ in Millions			12 Months Ended
Debt (Details) - USD ($) $ in Millions	Sep. 28, 2025	Mar. 16, 2020	Sep. 28, 2025	Sep. 29, 2024
Debt Instrument [Line Items]
Long-term debt		$ 431.5
Proceeds from sales of assets			$ 6.5
Principal payments on long term borrowings			1.8
Liquidity	$ 10.0		10.0
Credit Agreement \| BH Finance \| Secured Term Loan
Debt Instrument [Line Items]
Term note	$ 455.5		$ 455.5	$ 445.9
Long-term debt, interest rate	9.00%		9.00%
Long-term debt, increase in outstanding balance	$ 11.3
Prepayment of net cash proceeds, percent	100.00%	100.00%	100.00%
Prepayment obligation period	3 days		3 days
Debt instrument, covenant, net cash proceeds threshold for term loan prepayment		$ 0.5
Debt instrument, covenant, excess cash flow threshold for term loan prepayment		$ 20.0
Debt instrument, covenant, excess cash flow, period after quarter end (days)		50 days
Debt instrument, covenant, change of control, repayment percentage		105.00%
BHMG
Debt Instrument [Line Items]
Combined purchase price		$ 140.0