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Stock-Based Compensation
3 Months Ended
Aug. 31, 2019
Stock-Based Compensation [Abstract]  
Stock-Based Compensation Stock-Based Compensation

The following table summarizes the stock-based compensation expense and related income tax effect for the three months ended:
(In millions)
August 31, 2019
 
September 1, 2018
Stock-based compensation expense
$
2.6

 
$
2.5

Related income tax effect
0.6

 
0.6



Certain of the Company's equity-based compensation awards contain provisions that allow for continued vesting into retirement. Stock-based awards are considered fully vested for expense attribution purposes when the employee's retention of the award is no longer contingent on providing subsequent service.