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CREDIT ARRANGEMENTS (Long-term Debt) (Details) - USD ($) $ in Thousands	Aug. 31, 2019	May 31, 2019	Aug. 31, 2018	Jul. 31, 2017	May 31, 2013
Debt Instrument [Line Items]
Total long-term debt including current maturities	$ 1,254,921		$ 1,170,129
Less debt issuance costs	10,268		11,764
Total long-term debt outstanding	1,244,653		1,158,365
Current maturities of long-term debt	13,510		19,746
Less short-term borrowings	3,929		0
Current maturities of long-term debt and short-term borrowings	17,439		19,746
Long-term debt	$ 1,227,214		1,138,619
2027 Notes
Debt Instrument [Line Items]
Weighted average interest rate	5.375%			5.375%
Total long-term debt including current maturities	$ 300,000		300,000
2026 Notes
Debt Instrument [Line Items]
Weighted average interest rate	5.75%	5.75%
Total long-term debt including current maturities	$ 350,000		350,000
2023 Notes
Debt Instrument [Line Items]
Weighted average interest rate	4.875%				4.875%
Total long-term debt including current maturities	$ 330,000		330,000
Short-term borrowings
Debt Instrument [Line Items]
Total long-term debt including current maturities	3,929		0
Other, including equipment notes
Debt Instrument [Line Items]
Total long-term debt including current maturities	$ 60,867		47,629
Revolving credit agreement | Term Loan
Debt Instrument [Line Items]
Weighted average interest rate	4.111%
Total long-term debt including current maturities	$ 210,125		$ 142,500

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