EMPLOYEE STOCK PLANS - Narrative (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2017	Sep. 27, 2024	Sep. 29, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award
Expected dividend		0.00%
Options, grants in period, grant date fair value		$ 0.1	$ 4.0	$ 3.9
Options exercised, intrinsic value		0.0	0.1	0.5
Grant-date fair value of shares granted in the period		17.2	11.3	10.8
Shares outstanding, market value		$ 20.0	$ 24.0	$ 22.1
Employee Stock Purchase Plans
Share-based Compensation Arrangement by Share-based Payment Award
Expected dividend		0.00%	0.00%	0.00%
Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Compensation cost not yet recognized		$ 23.8
Compensation cost period for recognition (in years)		1 year 10 months 24 days
Expected dividend		0.00%	0.00%	0.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Award expiration period (in years)		7 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period (in months)		48 months
Award expiration period (in years)		10 years
2017 ESPP | Employee Stock Purchase Plans
Share-based Compensation Arrangement by Share-based Payment Award
Purchase price of common stock, percent	85.00%	85.00%
Purchase period	6 months
Number of additional shares authorized (in shares)				0.8
Number of shares authorized (in shares)		1.8
Stock plan offering period (in months)		6 months
2017 ESPP | Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares available for grant (in shares)		0.3
2020 Omnibus Stock Plan | Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares available for grant (in shares)		5.0