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Activity in Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2022
May 31, 2021
May 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance $ 1,400 $ 1,350 $ 1,700
Provision 332 239 393
Recoveries 98 139 49
Write-offs (180) (328) (792)
Ending Balance $ 1,650 $ 1,400 $ 1,350