Investments	6 Months Ended
Nov. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Investments	Investments Investments at November 30, 2018 of $183.5 million include the cash surrender value of insurance policies of $165.4 million, equity method investments of $16.9 million and cost method investments of $1.2 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 six months ended November 30, 2018 and 2017, no impairment losses were recorded. During the three months ended November 30, 2018, Cintas sold a cost method investment to a third party. Proceeds from the sale were $73.3 million, which resulted in a pre-tax gain of $69.4 million.

Investments

Investments at November 30, 2018 of $183.5 million include the cash surrender value of insurance policies of $165.4 million, equity method investments of $16.9 million and cost method investments of $1.2 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 six months ended November 30, 2018 and 2017, no impairment losses were recorded.

During the three months ended November 30, 2018, Cintas sold a cost method investment to a third party. Proceeds from the sale were $73.3 million, which resulted in a pre-tax gain of $69.4 million.