DEBT - Debt Covenants - Excluding Timber Funds (Details) - Term Credit Agreement borrowings due 2028 at a variable interest rate of 1.8% at March 31, 2021 - Excluding Timber Funds	Sep. 30, 2021
Debt Instrument [Line Items]
Covenant EBITDA to consolidated interest expense, Covenant Requirement	2.5
Covenant EBITDA to consolidated interest expense, Actual ratio	11.6
Covenant EBITDA to consolidated interest expense, Favorable	9.1
Covenant debt to net worth plus covenant debt, Covenant Requirement	0.65
Covenant debt to net worth plus covenant debt, Actual ratio	0.44
Covenant debt to net worth plus covenant debt, favorable	0.21