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Inventories
9 Months Ended
Dec. 31, 2023
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following (in thousands):
December 31,
2023
March 31,
2023
At cost - FIFO basis:
Raw materials$167,833 $142,490 
Work-in-process26,788 26,323 
Finished goods41,449 39,714 
Total at cost FIFO basis236,070 208,527 
LIFO cost less than FIFO cost(31,674)(29,168)
Net inventories$204,396 $179,359 

The acquisition of montratec contributed $4,083,000 to the increase in inventory since March 31, 2023.

An actual valuation of inventory under the LIFO method can be made only at the end of each year based on the inventory levels and costs at that time. Accordingly, interim LIFO calculations must necessarily be based on management's estimates of expected year-end inventory levels and costs. Because these are subject to many factors beyond management's control, estimated interim results are subject to change in the final year-end LIFO inventory valuation.