Investments	3 Months Ended
	Aug. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Investments	InvestmentsInvestments at August 31, 2019 of $209.0 million include the cash surrender value of insurance policies of $187.4 million, equity method investments of $18.4 million and cost method investments of $3.2 million. Investments at May 31, 2019 of $192.3 million include the cash surrender value of insurance policies of $170.5 million, equity method investments of $18.6 million and cost method investments of $3.2 million. Investments are generally evaluated for impairment on an annual basis or when indicators of impairment exist. For the three months ended August 31, 2019 and 2018, no impairment losses were recorded.