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Inventories, Net (Notes)
6 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories, Net Inventories, Net
We use the last-in, first-out (“LIFO”) and first-in, first-out (“FIFO”) cost methods to value inventory. Inventory valued using the LIFO cost method is stated at the lower of cost or market. Inventory valued using the FIFO cost method is stated at the lower of cost or net realizable value. An actual valuation of inventory under the LIFO method is made only at the end of the fiscal year based on the inventory levels and costs at that time. Accordingly, interim LIFO calculations are based on management’s estimates of expected year-end inventory levels and are subject to the final fiscal year-end LIFO inventory valuation. Inventory costs include material, labor, and overhead. Inventories, net consisted of the following:
 September 30,
2020
March 31,
2020
Raw materials$101,608 $94,321 
Work in process40,617 35,643 
Finished goods172,483 151,381 
LIFO reserve(18,752)(16,937)
Reserve for excess and obsolete inventory(17,363)(16,149)
Inventories, net$278,593 $248,259