NEW MARKETS TAX CREDIT TRANSACTIONS (Details) $ in Millions	12 Months Ended	24 Months Ended
	Aug. 31, 2021 USD ($)	Dec. 31, 2017 numberOfTaxCreditTransactions
Income Tax Contingency [Line Items]
Number of New Markets Tax Credit transactions | numberOfTaxCreditTransactions		3
Fund 156 | Micro Mill
Income Tax Contingency [Line Items]
USBCDC Capital Contribution	$ 17.7
Commonwealth Loan	$ 35.3
Commonwealth Loan Rate (Percent)	1.08%
QEI to CDE	$ 51.5
Fund 156 | Micro Mill | Qualified Equity Investment Loans | CMC Steel Oklahoma, LLC
Income Tax Contingency [Line Items]
CDE Loan	50.7
Fund 249 | Spooler Project
Income Tax Contingency [Line Items]
USBCDC Capital Contribution	6.7
Commonwealth Loan	$ 14.0
Commonwealth Loan Rate (Percent)	1.39%
QEI to CDE	$ 20.0
Fund 249 | Spooler Project | Qualified Equity Investment Loans | CMC Steel Oklahoma, LLC
Income Tax Contingency [Line Items]
CDE Loan	$ 19.4
Fund 219
Income Tax Contingency [Line Items]
Period at end of which Company may be entitled or obligated to repurchase interest in the fund	8 years
Fund 219 and Fund 222 | T-post Shop
Income Tax Contingency [Line Items]
USBCDC Capital Contribution	$ 5.0
Commonwealth Loan	$ 10.4
Commonwealth Loan Rate (Percent)	1.16%
QEI to CDE	$ 15.0
Fund 219 and Fund 222 | T-post Shop | Qualified Equity Investment Loans | CMC Steel Oklahoma, LLC
Income Tax Contingency [Line Items]
CDE Loan	$ 14.7
Fund 156 and Fund 249
Income Tax Contingency [Line Items]
Period at end of which Company may be entitled or obligated to repurchase interest in the fund	7 years
Fund 222 | Qualified Equity Investment Loans
Income Tax Contingency [Line Items]
CDE Loan	$ 2.1