Inventories

3 Months Ended

Jul. 31, 2021

Inventory, Net [Abstract]

Inventories

Inventories

The components of inventories were: 

	July 31,		April 30,
(in thousands)	2021		2021 As Adjusted
Raw materials	$	80,700	$	63,384
Work-in-process	55,875		51,176
Finished goods	45,219		43,607
Total inventories	$	181,794	$	158,167

Effective May 1, 2021, the Company changed its accounting principle for inventory valuation from a LIFO basis to a FIFO basis. See Note A - Basis of Presentation for additional information on the effect of the change.