Accrued Loss Reserves (Detail) - USD ($) $ in Thousands	May 31, 2023	May 31, 2022
Schedule Of Accrued Liabilities [Line Items]
Accrued losses	$ 26,470	$ 24,508
Accrued Loss Reserves - Noncurrent	32,350	35,935
Accrued product liability and other loss reserves
Schedule Of Accrued Liabilities [Line Items]
Accrued losses	16,995	16,003
Accrued Loss Reserves - Noncurrent	22,849	26,226
Accrued warranty reserves
Schedule Of Accrued Liabilities [Line Items]
Accrued losses	8,448	7,450
Accrued Loss Reserves - Noncurrent	3,328	3,455
Accrued environmental reserves
Schedule Of Accrued Liabilities [Line Items]
Accrued losses	1,027	1,055
Accrued Loss Reserves - Noncurrent	$ 6,173	$ 6,254