Schedule of Combined Financial Information for Unconsolidated Affiliates (Detail) (USD $) In Thousands, unless otherwise specified	May 31, 2014		May 31, 2013
Investments in and Advances to Affiliates [Line Items]
Cash	$ 52,997		$ 70,380
Receivable from partner	12,717	[1]	69,706	[1]
Other current assets	454,417		518,262
Noncurrent assets	294,001		350,681
Total assets	814,132		1,009,029
Current liabilities	128,595		181,111
Short-term borrowings	40,992		21,369
Current maturities of long-term debt	4,510		5,442
Long-term debt	268,350		274,750
Other noncurrent liabilities	20,217		18,345
Equity	351,468		508,012
Total liabilities and equity	$ 814,132		$ 1,009,029

[1] Represents cash owed from a joint venture partner as a result of centralized cash management.