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Debt and Derivatives - Narrative (Details)
9 Months Ended 12 Months Ended
Dec. 01, 2017
USD ($)
Feb. 28, 2017
USD ($)
May 31, 2018
USD ($)
contract
May 31, 2017
USD ($)
contract
May 31, 2016
USD ($)
Sep. 16, 2016
USD ($)
Sep. 15, 2016
USD ($)
Feb. 29, 2016
USD ($)
Debt Instrument [Line Items]                
Average interest rate (as a percent)     3.80%          
Long-term debt, carrying amount     $ 2,535,309,000 $ 2,770,624,000        
Proceeds from issuance of commercial paper $ 265,000,000              
Letters of credit outstanding, amount     143,000,000 110,900,000        
Long-term Debt, Fiscal Year Maturity [Abstract]                
Maturities of long term debt, next twelve months     0          
Maturities of long term debt, year two     0          
Maturities of long term debt, year three     0          
Maturities of long term debt, year four     900,000,000          
Maturities of long term debt, year five     350,000,000          
Interest paid     122,100,000 76,600,000 $ 64,500,000      
Payments of financing costs     0 17,062,000 0      
Commercial paper     0 $ 50,500,000        
Borrowings on revolving credit facility     $ 0.0          
Foreign Currency Forward Contracts                
Long-term Debt, Fiscal Year Maturity [Abstract]                
Number of derivative instruments held | contract     0 0        
Other comprehensive Income                
Long-term Debt, Fiscal Year Maturity [Abstract]                
Amortization of interest rate lock agreements     $ (900,000) $ 1,100,000 $ 2,000,000      
Commercial paper                
Long-term Debt, Fiscal Year Maturity [Abstract]                
Weighted average interest rate (as a percent)     1.24%          
G & K Services                
Long-term Debt, Fiscal Year Maturity [Abstract]                
Payments of financing costs       17,100,000        
Senior notes | Treasury Lock | Designated as Hedging Instrument | Cash Flow Hedging                
Long-term Debt, Fiscal Year Maturity [Abstract]                
Notional amount               $ 550,000,000
Deferred gain on derivatives       30,200,000        
Term Notes Due Through 2036 | Unsecured Debt                
Debt Instrument [Line Items]                
Long-term debt, carrying amount     $ 2,550,000,000 3,156,000,000        
Long-term debt, fair value     $ 2,582,000,000 $ 3,296,800,000        
Senior Notes, 6.13%, 2018 Maturity | Senior notes                
Debt Instrument [Line Items]                
Repayment of senior notes $ 300,000,000              
Stated interest rate (as a percent) 6.13%   6.13%          
Debt instrument term 10 years              
Commercial Paper, 1.24% | Commercial paper                
Debt Instrument [Line Items]                
Repayment of debt     $ 50,500,000          
Debt Amendment June 2016                
Long-term Debt, Fiscal Year Maturity [Abstract]                
Revolving credit facility, maximum borrowing capacity with accordion feature             $ 450,000,000.0  
Debt Amendment September 2016                
Long-term Debt, Fiscal Year Maturity [Abstract]                
Revolving credit facility, maximum borrowing capacity with accordion feature           $ 600,000,000.0    
Line of credit facility, accordion feature, increase limit (up to)           250,000,000.0    
Debt Amendment September 2016 | Revolving Credit Facility                
Long-term Debt, Fiscal Year Maturity [Abstract]                
Revolving credit facility, maximum borrowing capacity with accordion feature           $ 250,000,000.0    
Borrowings on revolving credit facility     $ 0          
Senior Notes, 5-Year Maturity | Senior notes | Treasury Lock | Designated as Hedging Instrument | Cash Flow Hedging                
Debt Instrument [Line Items]                
Debt instrument term   5 years            
Long-term Debt, Fiscal Year Maturity [Abstract]                
Notional amount   $ 500,000,000.0            
Senior Notes, 10-Year Maturity | Senior notes | Treasury Lock | Designated as Hedging Instrument | Cash Flow Hedging                
Debt Instrument [Line Items]                
Debt instrument term   10 years            
Long-term Debt, Fiscal Year Maturity [Abstract]                
Notional amount   $ 1,000,000,000.0