Investments	9 Months Ended
Feb. 28, 2018
Investments, Debt and Equity Securities [Abstract]
Investments	Investments Investments at February 28, 2018 of $178.5 million include the cash surrender value of insurance policies of $153.5 million, equity method investments of $20.0 million and cost method investments of $5.0 million. Investments at May 31, 2017 of $164.8 million include the cash surrender value of insurance policies of $144.0 million, equity method investments of $15.8 million and cost method investments of $5.0 million. Investments are generally evaluated for impairment on an annual basis or when indicators of impairment exist. For the nine months ended February 28, 2018 and 2017, no impairment losses were recorded.

Investments

9 Months Ended

Feb. 28, 2018

Investments, Debt and Equity Securities [Abstract]

Investments at February 28, 2018 of $178.5 million include the cash surrender value of insurance policies of $153.5 million, equity method investments of $20.0 million and cost method investments of $5.0 million. Investments at May 31, 2017 of $164.8 million include the cash surrender value of insurance policies of $144.0 million, equity method investments of $15.8 million and cost method investments of $5.0 million.

Investments are generally evaluated for impairment on an annual basis or when indicators of impairment exist. For the nine months ended February 28, 2018 and 2017, no impairment losses were recorded.