BORROWINGS - Schedule of Short-Term and Long-Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 30, 2022
Current maturities of long-term debt:
Total current maturities of long-term debt	$ 46.5	$ 1.5
Net repayments of long term debt current maturities	45.0
Non-current maturities of long-term debt:
Long-term debt excluding current maturities, gross	400.1	446.5
Net proceeds(repayments) from long-term debt, excluding current maturities	(46.4)
Unamortized issuance costs and debt discounts:
Total	(3.2)	(5.4)
Non-cash operating lease expense	0.0	0.0	$ 8.8
Total	2.2
Total debt outstanding, net	443.4	442.6
Net proceeds from (repayments for) debt, net of issuance costs	0.8
Convertible Debt
Current maturities of long-term debt:
Total current maturities of long-term debt	$ 45.0	$ 0.0
Weighted-average interest rate, long-term debt (as a percent)	4.80%	4.80%
Proceeds from repayment	$ 45.0
Non-current maturities of long-term debt:
Long-term debt excluding current maturities, gross	155.0	$ 200.0
Repayment of convertible debt	(45.0)
Unamortized issuance costs and debt discounts:
Unamortized issuance costs - Convertible Notes	(1.0)	(2.5)
Decrease in unamortized discount	1.5
Other Debt
Current maturities of long-term debt:
Total current maturities of long-term debt	1.5	1.5
Proceeds from repayment of other debt	0.0
Non-current maturities of long-term debt:
Long-term debt excluding current maturities, gross	2.1	$ 3.5
Repayment of other long-term debt	$ (1.4)
Senior Secured Notes | Secured Debt
Current maturities of long-term debt:
Weighted-average interest rate, long-term debt (as a percent)	8.20%	8.20%
Non-current maturities of long-term debt:
Long-term debt excluding current maturities, gross	$ 243.0	$ 243.0
Repayments for senior secured notes	0.0
Secured Debt
Unamortized issuance costs and debt discounts:
Debt issuance costs	(2.2)	$ (2.9)
Non-cash operating lease expense	$ 0.7