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INVENTORIES (Tables) | 9 Months Ended
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Dec. 31, 2019
Inventory Disclosure [Abstract] |
Schedule of Inventories | Inventories are stated at the lower of average cost (including applicable material, labor, depreciation, and plant overhead) or net realizable value, and consist of the following:
|  | December 31, |  |  | March 31, |
|  | 2019 |  |  | 2019 |
|  | (dollars in thousands) |
Raw Materials and Materials-in-Progress |  | $ | 93,865 |  |  | $ | 125,828 |
Finished Cement |  |  | 24,673 |  |  |  | 27,826 |
Aggregates |  |  | 7,588 |  |  |  | 7,351 |
Gypsum Wallboard |  |  | 4,881 |  |  |  | 7,124 |
Paperboard |  |  | 11,638 |  |  |  | 15,660 |
Frac Sand |  |  | 529 |  |  |  | 2,557 |
Repair Parts and Supplies |  |  | 81,445 |  |  |  | 80,676 |
Fuel and Coal |  |  | 9,645 |  |  |  | 8,172 |
|  | $ | 234,264 |  |  | $ | 275,194 |
During the nine months ended December 31, 2019, we wrote down approximately $3.3 million, $1.7 million, and $1.3 million of Raw Materials and Materials-in-Progress, Frac Sand, and Repair Parts and Supplies. These inventories related to the impairment of our Oil and Gas Proppants segment described in Footnote (C).

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