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QUARTERLY FINANCIAL INFORMATION (unaudited) - Additional information (Details) - USD ($) $ in Millions | 3 Months Ended
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Jan. 31, 2020 | Jul. 31, 2019 | Apr. 30, 2019 | Oct. 31, 2018
QUARTERLY FINANCIAL INFORMATION (unaudited) |  |  |  |
Loss on the TeesREP Biomass Power Plant project by APC | $ 2.6 | $ 3.4 | $ 27.6 |
Adjustment for research and development tax credit |  |  |  | $ 16.5

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