Fair Value Measurements - Assets Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value, Nonrecurring - USD ($) $ in Thousands		May 31, 2023		May 31, 2022		May 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		$ 2,693		$ 700
Long Lived Assets Held For Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		2,623	[1]	700	[2]
Long Lived Assets Held And Used
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	[3]	70
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		2,693		700
Fair Value, Inputs, Level 2 | Long Lived Assets Held For Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		2,623	[1]	$ 700	[2]
Fair Value, Inputs, Level 2 | Long Lived Assets Held And Used
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		$ 70	[3]			$ 5,934

[1] Comprised of the following: (1) idled equipment at the manufacturing facility in Taylor, Michigan; and (2) the net assets of Samuel's toll processing facility in Cleveland, Ohio. Refer to “Note E – Goodwill and Other Long-Lived Assets” for additional information.

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

[3] Comprised of certain assets associated with a capital project at our Building Products facility in Jefferson, Ohio which were written down to their estimated salvage value of $70. These assets continue to be held and used. Refer to “Note E – Goodwill and Other Long-Lived Assets” for additional information.