Summary of Long-term Debt and Short-term Borrowings Outstanding (Detail) - USD ($) $ in Thousands	May 31, 2017	May 31, 2016
Debt Instrument [Line Items]
Debt	$ 581,191	$ 583,991
Unamortized discount and debt issuance costs	(2,581)	(2,987)
Total debt, net	578,610	581,004
Total debt, net	578,610	581,004
Debt	6,814	3,513
Total long term debt	571,796	577,491
Short-term borrowings
Debt Instrument [Line Items]
Debt	123	2,651
4.55% Senior Notes due April 15, 2026
Debt Instrument [Line Items]
Debt	250,000	250,000
4.60% Senior Notes due August 10, 2024
Debt Instrument [Line Items]
Debt	150,000	150,000
6.50% Senior Notes due April 15, 2020
Debt Instrument [Line Items]
Debt	150,000	150,000
Term Loans
Debt Instrument [Line Items]
Debt	30,400	31,020
Other Debt
Debt Instrument [Line Items]
Debt	$ 668	$ 320

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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