Fair Value - Assets Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value, Nonrecurring - USD ($) $ in Thousands		Feb. 28, 2023	May 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		$ 70	$ 700
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		70	700
Long Lived Assets Held and Used
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	[1]	70
Long Lived Assets Held and Used | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	[1]	$ 70
Long Lived Assets Held for Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	[2]		700
Long Lived Assets Held for Sale | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	[2]		$ 700

[1] During the three months ended February 28, 2023, we recognized a pre-tax impairment charge of $484,000 related to certain assets associated with a capital project at our Building Products facility in Jefferson, Ohio, that were determined to have no alternative use and written down to their estimated salvage value of approximately $70,000.

[2] Comprised of production equipment at our Samuel facility in Twinsburg, Ohio facility with an estimated fair market value of $700,000. Refer to “Note E – Impairment of Long-Lived Assets” for additional information.