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REVENUE FROM CONTRACTS WITH CUSTOMERS - Supply contracts (Details) $ in Thousands | Sep. 30, 2023 USD ($)
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Performance obligations unsatisfied or partially unsatisfied |
Total | $ 3,497,837
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 658,762
Expected timing of satisfaction period | 3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,690,849
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 795,026
Expected timing of satisfaction period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 353,200
Expected timing of satisfaction period | 1 year
Illinois Basin Coal |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 2,369,577
Illinois Basin Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 424,747
Expected timing of satisfaction period | 3 months
Illinois Basin Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,123,629
Expected timing of satisfaction period | 1 year
Illinois Basin Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 469,601
Expected timing of satisfaction period | 1 year
Illinois Basin Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 351,600
Expected timing of satisfaction period | 1 year
Appalachia Coal |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,128,260
Appalachia Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 234,015
Expected timing of satisfaction period | 3 months
Appalachia Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 567,220
Expected timing of satisfaction period | 1 year
Appalachia Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 325,425
Expected timing of satisfaction period | 1 year
Appalachia Coal | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |
Performance obligations unsatisfied or partially unsatisfied |
Total | $ 1,600
Expected timing of satisfaction period | 1 year

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