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FAIR VALUE MEASUREMENTS - Summary of Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 28, 2025	Sep. 30, 2024	Jun. 29, 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	$ 22.8	$ 51.2	$ 245.0
Carrying Amount | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring | Investment securities in non-qualified retirement plan assets
Assets
Other	32.6	32.4	32.3
Carrying Amount | Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments
Assets
Other	27.5	45.8	89.7
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Term loans
Liabilities
Debt instruments	587.5	625.0	887.5
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
Estimated Fair Value | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	22.8	51.2	245.0
Estimated Fair Value | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring | Investment securities in non-qualified retirement plan assets
Assets
Other	32.6	32.4	32.3
Estimated Fair Value | Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments
Assets
Other	27.5	45.8	89.7
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Term loans
Liabilities
Debt instruments	587.5	625.0	887.5
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.000% Senior Notes
Liabilities
Debt instruments	455.0	456.3	431.3
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.375% Senior Notes
Liabilities
Debt instruments	365.0	370.0	344.5
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.500% Senior Notes
Liabilities
Debt instruments	434.3	432.0	409.5
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 5.250% Senior Notes
Liabilities
Debt instruments	$ 248.8	$ 248.8	$ 243.1

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