FAIR VALUE (Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)		Aug. 31, 2020	Aug. 31, 2019
Commodity | Significant Unobservable Inputs (Level 3) | Valuation Technique, Discounted Cash Flow | Low
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Energy Floating Rate		$ 151.66
Commodity | Significant Unobservable Inputs (Level 3) | Valuation Technique, Discounted Cash Flow | High
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Energy Floating Rate		243.88
Commodity | Significant Unobservable Inputs (Level 3) | Valuation Technique, Discounted Cash Flow | Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Energy Floating Rate		200.70
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market investments	[1]	449,824,000	$ 66,240,000
Fair value, measurements, recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market investments	[1]	449,824,000	66,240,000
Fair value, measurements, recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market investments	[1]	0	0
Fair value, measurements, recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market investments	[1]	0	0
Fair value, measurements, recurring | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	[2]	202,000	1,269,000
Derivative liabilities	[2]	19,000,000	99,000
Fair value, measurements, recurring | Commodity | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	[2]	202,000	1,269,000
Derivative liabilities	[2]	3,993,000	99,000
Fair value, measurements, recurring | Commodity | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	[2]	0	0
Derivative liabilities	[2]		0
Fair value, measurements, recurring | Commodity | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	[2]	0	0
Derivative liabilities	[2]	15,007,000	0
Fair value, measurements, recurring | Foreign exchange
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	[2]	1,484,000	569,000
Derivative liabilities	[2]	459,000	899,000
Fair value, measurements, recurring | Foreign exchange | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	[2]	0	0
Derivative liabilities	[2]	0	0
Fair value, measurements, recurring | Foreign exchange | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	[2]	1,484,000	569,000
Derivative liabilities	[2]	459,000	899,000
Fair value, measurements, recurring | Foreign exchange | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	[2]	0	0
Derivative liabilities	[2]	$ 0	$ 0

[1] (1) Investment deposit accounts are short-term in nature, and the value is determined by principal plus interest. The investment portfolio mix can change each period based on the Company's assessment of investment options.

[2] (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. Derivative liabilities classified as Level 3, and the methodology used to determine their fair value, are described below. Further discussion regarding the Company's use of derivative instruments is included in Note 12, Derivatives.
The fair value estimate of the Level 3 commodity derivative is based on an internally developed discounted cash flow model primarily utilizing unobservable inputs in which there is little or no market data. The Company forecasts future energy rates using a range of historical prices ("floating rate"). The floating rate is the only significant unobservable input used in the Company's discounted cash flow model. August 31, 2020Unobservable InputsLowHighAverageFloating rate (PLN)151.66 243.88 200.70  Below is a reconciliation of the beginning and ending balances of the Level 3 commodity derivative recognized in the consolidated statements of comprehensive income. The fluctuation in energy rates over time may cause volatility in the fair value estimate and is the primary reason for the unrealized loss in other comprehensive income ("OCI") in 2020.