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Investments (Tables)
 12 Months Ended
May 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Summary of Investments
Cintas' investments are summarized as follows at May 31:

(In thousands)20222021
Cash surrender value of insurance policies$237,136 $252,061 
Equity method investments3,574 19,388 
Cost method investments2,163 3,167 
Total investments$242,873 $274,616