Inventories, net (Details) - USD ($) $ in Thousands	May 31, 2022	May 31, 2021
Inventories, net
Raw materials	$ 16,264	$ 28,085
Work-in-progress	1,665	65,394
Inventories, net	$ 17,929	$ 93,479

Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_InventoryNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant