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INVENTORIES | 9 Months Ended
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Dec. 31, 2019
Inventory Disclosure [Abstract] |
INVENTORIES | (H) 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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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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