FAIR VALUE (Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2014		Aug. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 2,900	[1]	$ 3,930	[1]
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market investments	200,487	[2]	236,727	[2]
Fair value, measurements, recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market investments	200,487	[2]	236,727	[2]
Fair value, measurements, recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market investments	0	[2]	0	[2]
Fair value, measurements, recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market investments	0	[2]	0	[2]
Fair value, measurements, recurring | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	911	[3]	1,066	[3]
Derivative liabilities	168	[3]	1,397	[3]
Fair value, measurements, recurring | Commodity | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	911	[3]	1,066	[3]
Derivative liabilities	162	[3]	1,268	[3]
Fair value, measurements, recurring | Commodity | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	[3]	0	[3]
Derivative liabilities	6	[3]	129	[3]
Fair value, measurements, recurring | Commodity | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	[3]	0	[3]
Fair value, measurements, recurring | Foreign exchange
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	1,989	[3]	2,864	[3]
Derivative liabilities	1,335	[3]	2,170	[3]
Fair value, measurements, recurring | Foreign exchange | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	[3]	0	[3]
Derivative liabilities	0	[3]	0	[3]
Fair value, measurements, recurring | Foreign exchange | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	1,989	[3]	2,864	[3]
Derivative liabilities	1,335	[3]	2,170	[3]
Fair value, measurements, recurring | Foreign exchange | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	[3]	0	[3]
Derivative liabilities	$ 0	[3]	$ 0	[3]

[1] * Derivative assets and liabilities do not include the hedged items designated as fair value hedges.

[2] (1) Money market investments are short-term in nature, and the value is determined by broker quoted prices in active markets. The investment portfolio mix can change each period based on the Company's assessment of investment options.

[3] (2) Derivative assets and liabilities classified as Level 1 are commodity futures contracts valued based on quoted market prices in the London Metal Exchange or the New York Mercantile Exchange. Amounts in Level 2 are based on broker quotes in the over-the-counter market. Further discussion regarding the Company's use of derivative instruments and the classification of the assets and liabilities is included in Note 12, Derivatives and Risk Management.