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Inventories
6 Months Ended
Oct. 31, 2014
Inventory, Net [Abstract]  
Inventories
Inventories
 
The components of inventories were: 
 

October 31,

April 30,
(in thousands)

2014

2014
Raw materials

$
17,056


$
13,756

Work-in-process

18,887


19,179

Finished goods

14,262


13,439








Total FIFO inventories

50,205


46,374








Reserve to adjust inventories to LIFO value

(14,870
)

(14,851
)







Total LIFO inventories

$
35,335


$
31,523


 
Interim LIFO calculations are based on management’s estimates of expected year-end inventory levels and costs.  Since these items are estimated, interim results are subject to the final year-end LIFO inventory valuation.