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Stock-Based Compensation (Performance Stock Unit Activity) (Narrative) (Details) - USD ($)
12 Months Ended
May 31, 2020
May 26, 2019
May 27, 2018
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Line Items]      
Vesting period (in years) 4 years    
Equity-settled performance-based restricted stock units      
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to unvested stock options granted $ 19,300,000    
Unrecognized compensation cost, period of recognition (in years) 2 years 1 month 6 days    
Fair market value on grant date $ 13,400,000    
Employee stock purchase plan      
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Line Items]      
Percentage of capital stock (percentage) 5.00%    
Investment authorized $ 5,000.0    
Shares available for purchase by employees (in shares) 5,200,000    
Percent of fair market value, common stock purchased by employees (percentage) 85.00%    
Cash received from employees who acquired shares under ESPP $ 8,300,000 $ 7,100,000 $ 5,800,000
Minimum | Equity-settled performance-based restricted stock units      
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Line Items]      
Vesting period (in years) 3 years    
Service period (in years) 2 years    
Maximum | Equity-settled performance-based restricted stock units      
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Line Items]      
Vesting period (in years) 4 years    
Service period (in years) 5 years