Revenue Recognition - Summary of Unbilled Receivables and Contract Assets (Detail) - USD ($) $ in Thousands		Aug. 31, 2021	May 31, 2021
Receivables
Unbilled Receivables And Contract Assets [Line Items]
Unbilled receivables	[1]	$ 5,196	$ 5,317

[1] There were no contract assets at either of the dates indicated above.