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FAIR VALUE MEASUREMENTS - Summary of Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 29, 2025	Sep. 30, 2024	Mar. 30, 2024	Aug. 13, 2021	Mar. 17, 2021	Oct. 22, 2019	Dec. 15, 2016
Senior notes | 4.000% Senior Notes
Liabilities
Interest rate of debt (percentage)	4.00%	4.00%	4.00%		4.00%
Senior notes | 4.375% Senior Notes
Liabilities
Interest rate of debt (percentage)	4.375%	4.375%	4.375%	4.375%
Senior notes | 4.500% Senior Notes
Liabilities
Interest rate of debt (percentage)	4.50%	4.50%	4.50%			4.50%
Senior notes | 5.250% Senior Notes
Liabilities
Interest rate of debt (percentage)	5.25%	5.25%	5.25%				5.25%
Carrying Amount | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	$ 5.0	$ 51.2	$ 28.1
Carrying Amount | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring | Investment securities in non-qualified retirement plan assets
Assets
Other	30.4	32.4	42.3
Carrying Amount | Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments
Assets
Other	28.1	45.8	84.5
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Revolving loans
Liabilities
Debt instruments	345.0	0.0	314.2
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Term loans
Liabilities
Debt instruments	600.0	625.0	900.0
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.000% Senior Notes
Liabilities
Debt instruments	500.0	500.0	500.0
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.375% Senior Notes
Liabilities
Debt instruments	400.0	400.0	400.0
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.500% Senior Notes
Liabilities
Debt instruments	450.0	450.0	450.0
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 5.250% Senior Notes
Liabilities
Debt instruments	250.0	250.0	250.0
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Other debt
Liabilities
Debt instruments	2.5	0.0	5.5
Estimated Fair Value | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	5.0	51.2	28.1
Estimated Fair Value | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring | Investment securities in non-qualified retirement plan assets
Assets
Other	30.4	32.4	42.3
Estimated Fair Value | Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments
Assets
Other	28.1	45.8	84.5
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Revolving loans
Liabilities
Debt instruments	345.0	0.0	314.2
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Term loans
Liabilities
Debt instruments	600.0	625.0	900.0
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.000% Senior Notes
Liabilities
Debt instruments	440.0	456.3	427.5
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.375% Senior Notes
Liabilities
Debt instruments	353.0	370.0	344.0
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.500% Senior Notes
Liabilities
Debt instruments	420.8	432.0	405.0
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 5.250% Senior Notes
Liabilities
Debt instruments	247.8	248.8	245.6
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Other debt
Liabilities
Debt instruments	$ 2.5	$ 0.0	$ 5.5

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