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Inventories | 9 Months Ended
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Feb. 28, 2021
Inventories | 3. INVENTORIES Inventories are stated at the lower of cost, determined by the first-in, first-out method, or net realizable value. The components of inventories follow:​​​​​​​​​​​​​​
(in thousands) |  | February 28, 2021 |  |  | May 31, 2020 |
Raw materials |  | $ | 46,423 |  |  | $ | 45,058 |
Work-in-process |  |  | 7,408 |  |  |  | 6,887 |
Finished and purchased goods |  |  | 45,436 |  |  |  | 43,108 |
|  | $ | 99,267 |  |  | $ | 95,053 |

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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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