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Inventories (Tables)
 3 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current

Inventories consisted of the following (in thousands):

 
 
June 30,
2019
 
March 31,
2019
At cost - FIFO basis:
 
 
 
 
Raw materials
 
$
97,546

 
$
88,786

Work-in-process
 
30,978

 
32,547

Finished goods
 
39,961

 
40,523

Total at cost FIFO basis
 
168,485

 
161,856

LIFO cost less than FIFO cost
 
(17,517
)
 
(15,593
)
Net inventories
 
$
150,968

 
$
146,263