Retirement Plans (Fair Values Of Defined Benefit Pension Plans Assets) (Details) - USD ($) $ in Millions	May 28, 2017	May 29, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	$ 207.7	$ 242.0
Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	6.2	33.9
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	201.5	208.1
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
U.S. Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	63.7	75.3
U.S. Commingled Funds | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
U.S. Commingled Funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	63.7	75.3
U.S. Commingled Funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
International Commingled Fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	22.8	24.9
International Commingled Fund | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
International Commingled Fund | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	22.8	24.9
International Commingled Fund | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
Emerging Market Commingled Fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	6.0	6.8
Emerging Market Commingled Fund | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
Emerging Market Commingled Fund | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	6.0	6.8
Emerging Market Commingled Fund | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
Emerging Market Mutual Fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	5.7	5.9
Emerging Market Mutual Fund | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	5.7	5.9
Emerging Market Mutual Fund | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
Emerging Market Mutual Fund | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
Real Estate Commingled Fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	6.0	7.5
Real Estate Commingled Fund | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
Real Estate Commingled Fund | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	6.0	7.5
Real Estate Commingled Fund | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
U.S. Treasury securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		25.9
U.S. Treasury securities | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		25.9
U.S. Treasury securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		0.0
U.S. Treasury securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		0.0
U.S. Corporate Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		37.8
U.S. Corporate Securities | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		0.0
U.S. Corporate Securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		37.8
U.S. Corporate Securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		0.0
International Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		6.3
International Securities | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		0.0
International Securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		6.3
International Securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		0.0
Public Sector Utility Securities
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		14.8
Public Sector Utility Securities | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		0.0
Public Sector Utility Securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		14.8
Public Sector Utility Securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets		0.0
Global Fixed-Income Commingled Fund
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	20.6	24.4
Global Fixed-Income Commingled Fund | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
Global Fixed-Income Commingled Fund | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	20.6	24.4
Global Fixed-Income Commingled Fund | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
U.S. Fixed-Income Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	82.4	10.3
U.S. Fixed-Income Commingled Funds | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
U.S. Fixed-Income Commingled Funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	82.4	10.3
U.S. Fixed-Income Commingled Funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
Cash & Accruals
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.5	2.1
Cash & Accruals | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.5	2.1
Cash & Accruals | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	0.0	0.0
Cash & Accruals | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair values of the defined benefit pension plans assets	$ 0.0	$ 0.0