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Inventories | 12 Months Ended
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Apr. 30, 2022
Inventory Disclosure [Abstract] |
Inventories | Inventories The components of inventories were:
| APRIL 30
(in thousands) | 2022 |  | 2021
Raw materials | $ | 90,451 |  |  | $ | 63,384 |
Work-in-process | 59,180 |  |  | 51,176 |
Finished goods | 78,628 |  |  | 43,607 |
Total inventories | $ | 228,259 |  |  | $ | 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 — Summary of Significant Accounting Policies for additional information on the effect of the change.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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