FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Jan. 01, 2021	Oct. 02, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 45.8	$ 44.9
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	0.1
Total assets measured at fair value	196.9	247.5
Derivative liabilities	(8.1)	(0.1)
Contingent consideration	(47.9)	(43.1)
Total liabilities measured at fair value	(56.0)	(43.2)
Fair Value, Measurements, Recurring | MPTC Series B-1 Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	19.2	18.9
Fair Value, Measurements, Recurring | MPTC Series B-2 Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	21.1	20.6
Fair Value, Measurements, Recurring | APTC securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	5.5	5.4
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	0.0
Total assets measured at fair value	125.3	148.0
Derivative liabilities	0.0	0.0
Contingent consideration	0.0	0.0
Total liabilities measured at fair value	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments | MPTC Series B-1 Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments | MPTC Series B-2 Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	0.0	0.0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments | APTC securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	0.1
Total assets measured at fair value	71.6	99.5
Derivative liabilities	(8.1)	(0.1)
Contingent consideration	0.0	0.0
Total liabilities measured at fair value	(8.1)	(0.1)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs | MPTC Series B-1 Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	19.2	18.9
Fair Value, Measurements, Recurring | Significant Other Observable Inputs | MPTC Series B-2 Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	21.1	20.6
Fair Value, Measurements, Recurring | Significant Other Observable Inputs | APTC securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	5.5	5.4
Fair Value, Measurements, Recurring | Significant Unobservable Inputs
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	0.0
Total assets measured at fair value	0.0	0.0
Derivative liabilities	0.0	0.0
Contingent consideration	(47.9)	(43.1)
Total liabilities measured at fair value	(47.9)	(43.1)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs | MPTC Series B-1 Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs | MPTC Series B-2 Bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs | APTC securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities	0.0	0.0
Fair Value, Measurements, Recurring | Money market funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	87.0	148.0
Equity investments	64.0	54.6
Fair Value, Measurements, Recurring | Money market funds | Quoted Prices in Active Markets for Identical Instruments
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	87.0	148.0
Equity investments	38.3	0.0
Fair Value, Measurements, Recurring | Money market funds | Significant Other Observable Inputs
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	0.0	0.0
Equity investments	25.7	54.6
Fair Value, Measurements, Recurring | Money market funds | Significant Unobservable Inputs
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	0.0	0.0
Equity investments	$ 0.0	$ 0.0