Fair Value Measurements - Fair Values Of Financial Instruments Measured At Fair Value On Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	May 26, 2019	May 27, 2018
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	$ (0.8)	$ 1.1
Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	0.0	0.0
Significant Other Observable Inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	(0.8)	1.1
Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	0.0	0.0
Commodities futures, swaps & options
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives		0.5
Commodities futures, swaps & options | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives		0.0
Commodities futures, swaps & options | Significant Other Observable Inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives		0.5
Commodities futures, swaps & options | Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives		0.0
Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	(0.8)	0.6
Equity forwards | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.0	0.0
Equity forwards | Significant Other Observable Inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	(0.8)	0.6
Equity forwards | Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	$ 0.0	$ 0.0