Stockholders' Equity - Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock based compensation pre tax amount	$ 10,529	$ 11,158	$ 10,692
Cost of sales
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock based compensation pre tax amount	288	793	827
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock based compensation pre tax amount	1,400	1,459	1,298
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock based compensation pre tax amount	3,243	2,922	2,568
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock based compensation pre tax amount	5,595	5,984	5,999
Acquisition, restructuring and other items, net
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock based compensation pre tax amount	$ 3	$ 0	$ 0