Debt and Receivables Securitization - Summary of Long-term Debt and Short-term Borrowings Outstanding (Detail) - USD ($) $ in Thousands	May 31, 2018	May 31, 2017
Debt Instrument [Line Items]
Short-term borrowings		$ 123
Debt	$ 754,728
Total debt	754,728	581,191
Unamortized discount and debt issuance costs	(4,360)	(2,581)
Total debt, net	750,368	578,610
Less: current maturities and short-term borrowings	1,474	6,814
Total long-term debt	748,894	571,796
Short-term borrowings
Debt Instrument [Line Items]
Short-term borrowings		123
4.30% Senior Notes due August 1, 2032
Debt Instrument [Line Items]
Senior notes	200,000
4.55% Senior Notes due April 15, 2026
Debt Instrument [Line Items]
Senior notes	250,000	250,000
4.60% Senior Notes due August 10, 2024
Debt Instrument [Line Items]
Senior notes	150,000	150,000
6.50% Senior Notes due April 15, 2020
Debt Instrument [Line Items]
Senior notes	150,000	150,000
Term Loans
Debt Instrument [Line Items]
Debt	829	30,400
Other Debt
Debt Instrument [Line Items]
Debt	$ 3,899	$ 668

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt long-term and short-term combined amount net of unamortized discount and debt issue costs.

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