FAIR VALUE (Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)	Aug. 31, 2021		Aug. 31, 2020
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	$ 240.09		$ 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	374.92		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	286.06		200.70
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market investments	441,297,000	[1]	449,824,000
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	441,297,000	[1]	449,824,000
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	0	[1]	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	0	[1]	0
Fair value, measurements, recurring | Commodity
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	27,323,000	[2]	202,000
Derivative liabilities	1,352,000	[2]	19,000,000
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	910,000	[2]	202,000
Derivative liabilities	1,352,000	[2]	3,993,000
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	0	[2]	0
Derivative liabilities	0	[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	26,413,000	[2]	0
Derivative liabilities	0	[2]	15,007,000
Fair value, measurements, recurring | Foreign exchange
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2,537,000	[2]	1,484,000
Derivative liabilities	1,880,000	[2]	459,000
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	0	[2]	0
Derivative liabilities	0	[2]	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	2,537,000	[2]	1,484,000
Derivative liabilities	1,880,000	[2]	459,000
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	0	[2]	0
Derivative liabilities	$ 0	[2]	$ 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. Derivatives classified as Level 3 are described below. Further discussion regarding the Company's use of derivative instruments is included in Note 10, 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 following table summarizes the floating rate during 2021 and 2020, which is the only significant unobservable input used in the Company's discounted cash flow model: Floating Rate (PLN)Year Ended August 31, LowHighAverage2020151.66 243.88 200.70 2021240.09 374.92 286.06 
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 gains and losses in other comprehensive income ("OCI") in 2021 and 2020.