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Activity in Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance $ 1,550 $ 2,000 $ 1,500
Provision 263 152 645
Recoveries 38 40 25
Write-offs (151) (642) (170)
Ending Balance $ 1,700 $ 1,550 $ 2,000