FAIR VALUE MEASUREMENTS - Summary of Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 27, 2026	Sep. 30, 2025	Jun. 28, 2025	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	$ 5.2	$ 25.3	$ 22.8
Carrying Amount \| Fair value, inputs, level 1 \| Fair Value, Measurements, Recurring \| Investment securities in non-qualified retirement plan assets
Assets
Other	33.2	32.6	32.6
Carrying Amount \| Fair value, inputs, level 1 \| Fair Value, Measurements, Recurring \| Vireo equity securities – common shares
Assets
Other	70.9	0.0	0.0
Carrying Amount \| Fair value, inputs, level 2 \| Fair Value, Measurements, Recurring \| Credit facilities \| Revolving loans
Liabilities
Debt instruments	25.0	0.0	0.0
Carrying Amount \| Fair value, inputs, level 2 \| Fair Value, Measurements, Recurring \| Credit facilities \| Term loans
Liabilities
Debt instruments	487.5	500.0	587.5
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
Carrying Amount \| Fair value, inputs, level 2 \| Fair Value, Measurements, Recurring \| Other debt
Liabilities
Debt instruments	0.0	5.2	0.0
Carrying Amount \| Fair value, inputs, level 3 \| Fair Value, Measurements, Recurring \| Vireo equity securities – warrant
Assets
Other	10.5	0.0	0.0
Carrying Amount \| Fair value, inputs, level 3 \| Fair Value, Measurements, Recurring \| Convertible debt investments
Assets
Other	23.9	24.6	27.5
Estimated Fair Value \| Fair value, inputs, level 1 \| Fair Value, Measurements, Recurring
Assets
Cash equivalents	5.2	25.3	22.8
Estimated Fair Value \| Fair value, inputs, level 1 \| Fair Value, Measurements, Recurring \| Investment securities in non-qualified retirement plan assets
Assets
Other	33.2	32.6	32.6
Estimated Fair Value \| Fair value, inputs, level 1 \| Fair Value, Measurements, Recurring \| Vireo equity securities – common shares
Assets
Other	70.9	0.0	0.0
Estimated Fair Value \| Fair value, inputs, level 2 \| Fair Value, Measurements, Recurring \| Credit facilities \| Revolving loans
Liabilities
Debt instruments	25.0	0.0	0.0
Estimated Fair Value \| Fair value, inputs, level 2 \| Fair Value, Measurements, Recurring \| Credit facilities \| Term loans
Liabilities
Debt instruments	487.5	500.0	587.5
Estimated Fair Value \| Fair value, inputs, level 2 \| Fair Value, Measurements, Recurring \| Senior notes \| 4.000% Senior Notes
Liabilities
Debt instruments	467.5	459.4	455.0
Estimated Fair Value \| Fair value, inputs, level 2 \| Fair Value, Measurements, Recurring \| Senior notes \| 4.375% Senior Notes
Liabilities
Debt instruments	372.5	367.0	365.0
Estimated Fair Value \| Fair value, inputs, level 2 \| Fair Value, Measurements, Recurring \| Senior notes \| 4.500% Senior Notes
Liabilities
Debt instruments	439.9	437.1	434.3
Estimated Fair Value \| Fair value, inputs, level 2 \| Fair Value, Measurements, Recurring \| Senior notes \| 5.250% Senior Notes
Liabilities
Debt instruments	249.4	249.4	248.8
Estimated Fair Value \| Fair value, inputs, level 2 \| Fair Value, Measurements, Recurring \| Other debt
Liabilities
Debt instruments	0.0	5.2	0.0
Estimated Fair Value \| Fair value, inputs, level 3 \| Fair Value, Measurements, Recurring \| Vireo equity securities – warrant
Assets
Other	10.5	0.0	0.0
Estimated Fair Value \| Fair value, inputs, level 3 \| Fair Value, Measurements, Recurring \| Convertible debt investments
Assets
Other	$ 23.9	$ 24.6	$ 27.5