Investments	3 Months Ended
Aug. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investments	Investments Investments at August 31, 2017 of $163.6 million include the cash surrender value of insurance policies of $143.4 million, equity method investments of $15.2 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 three months ended August 31, 2017 and 2016, no impairment losses were recorded.

Investments

3 Months Ended

Aug. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Investments at August 31, 2017 of $163.6 million include the cash surrender value of insurance policies of $143.4 million, equity method investments of $15.2 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 three months ended August 31, 2017 and 2016, no impairment losses were recorded.