Investments	3 Months Ended
Aug. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investments	Investments Investments at August 31, 2018 of $180.3 million include the cash surrender value of insurance policies of $160.2 million, equity method investments of $14.9 million and cost method investments of $5.2 million. Investments at May 31, 2018 of $175.6 million include the cash surrender value of insurance policies of $154.0 million, equity method investments of $16.4 million and cost method investments of $5.2 million. Investments are generally evaluated for impairment on an annual basis or when indicators of impairment exist. For the three months ended August 31, 2018 and 2017, no impairment losses were recorded. Subsequent to August 31, 2018, Cintas reached an agreement to sell a cost method investment to a third party. The anticipated gain on the sale will be recorded upon consummation of the sale.

Investments

Investments at August 31, 2018 of $180.3 million include the cash surrender value of insurance policies of $160.2 million, equity method investments of $14.9 million and cost method investments of $5.2 million. Investments at May 31, 2018 of $175.6 million include the cash surrender value of insurance policies of $154.0 million, equity method investments of $16.4 million and cost method investments of $5.2 million. Investments are generally evaluated for impairment on an annual basis or when indicators of impairment exist. For the three months ended August 31, 2018 and 2017, no impairment losses were recorded. Subsequent to August 31, 2018, Cintas reached an agreement to sell a cost method investment to a third party. The anticipated gain on the sale will be recorded upon consummation of the sale.