Inventories

The components of inventories were:



	January 31,			April 30,
(in thousands)	2018			2017
Raw materials	$	49,503		$	18,230
Work-in-process	40,330			18,704
Finished goods	31,617			19,372

Total FIFO inventories	121,450			56,306

Reserve to adjust inventories to LIFO value	(13,447		)	(13,447		)

Total inventories	$	108,003		$	42,859

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.