Schedule of Combined Financial Information for Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands		May. 31, 2015	May. 31, 2014
Investments in and Advances to Affiliates [Line Items]
Cash		$ 101,011	$ 52,997
Receivable from partner	[1]	11,092	12,717
Other current assets		491,507	454,417
Noncurrent assets		318,939	294,001
Total assets		922,549	814,132
Current liabilities		184,028	128,595
Short-term borrowings			40,992
Current maturities of long-term debt		4,489	4,510
Long-term debt		272,861	268,350
Other noncurrent liabilities		20,471	20,217
Equity		440,700	351,468
Total liabilities and equity		$ 922,549	$ 814,132

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