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Property, Plant, and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2026	May 31, 2025	May 31, 2024
Property, plant and equipment
Property, plant and equipment, Net	$ 27,097	$ 32,300
Depreciation expense	10,500	13,500	$ 14,700
Accelerated depreciation	300	3,400	$ 2,400
Property, Plant and Equipment Excluding Land And Improvements
Property, plant and equipment
Property, plant and equipment	107,412	103,023
Property, plant and equipment, Net	26,704	31,907
Building and building improvements
Property, plant and equipment
Property, plant and equipment	16,621	16,604
Computer software and equipment
Property, plant and equipment
Property, plant and equipment	29,738	29,038
Machinery and equipment
Property, plant and equipment
Property, plant and equipment	19,008	16,596
Placement and evaluation units
Property, plant and equipment
Property, plant and equipment	40,405	36,991
Construction in progress
Property, plant and equipment
Property, plant and equipment	1,640	3,794
Property, Plant and Equipment Excluding Building
Property, plant and equipment
Less accumulated depreciation	(80,708)	(71,116)
Land and land improvements
Property, plant and equipment
Property, plant and equipment	$ 393	$ 393