Investments	6 Months Ended
	Nov. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Investments	InvestmentsAt November 30, 2020, investments were $252.5 million and include the cash surrender value of insurance policies of $227.0 million, equity method investments of $22.3 million and cost method investments of $3.2 million. At May 31, 2020, investments were $214.8 million and include the cash surrender value of insurance policies of $192.7 million, equity method investments of $19.0 million and cost method investments of $3.1 million. Investments are generally evaluated for impairment on an annual basis or when indicators of impairment exist. For the three and six months ended November 30, 2020 and 2019, no impairment losses were recorded.