Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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EMPLOYEE STOCK PLANS - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2017	Oct. 01, 2021	Oct. 02, 2020	Sep. 27, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend		0.00%
Options, grants in period, grant date fair value		$ 3.7	$ 4.4	$ 3.0
Options exercised, intrinsic value		0.0	0.4	0.2
Grant-date fair value of shares granted in the period		8.9	11.9	9.0
Shares outstanding, market value		$ 30.9	$ 11.8	$ 19.2
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend		0.00%	0.00%	0.00%
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized		$ 22.9
Compensation cost period for recognition (in years)		2 years 8 months 12 days
Expected dividend		0.00%	0.00%	0.00%
2017 ESPP \| Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price of common stock, percent	85.00%	85.00%
Number of shares authorized (in shares)	1,000,000
Stock plan offering period (in months)		6 months
2017 ESPP \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)		300,000
2017 Omnibus Stock Plan \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)		4,100,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in months)		36 months
Award expiration period (in years)		7 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in months)		48 months
Award expiration period (in years)		10 years