SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) - USD ($) $ in Millions	12 Months Ended
Oct. 01, 2021	Oct. 02, 2020	Sep. 27, 2019
Inventory [Line Items]
Raw materials and parts	$ 168.0	$ 184.6
Work-in-process	20.4	23.9
Finished goods	36.4	63.4
Total inventories	224.8	271.9
Inventory write-down	3.5	18.1	$ 3.1
COVID-19 Pandemic
Inventory [Line Items]
Inventory write-down	$ 3.5	$ 15.8

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Aggregated amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. This amount is net of valuation reserves and adjustments.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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