Significant Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	May 31, 2022	May 31, 2021
Deferred income tax assets related to:
Inventories	$ 15,967	$ 12,189
Accrued compensation and benefits	22,224	24,637
Accrued other expenses	21,782	28,511
Deferred income and other long-term liabilities	25,389	22,859
Credit and net operating and capital loss carryforwards	63,368	65,091
Net unrealized loss on securities	9,386	9,189
Pension and other postretirement benefits	15,699	34,180
Total Deferred Income Tax Assets	173,815	196,656
Less: valuation allowances	(30,509)	(64,696)
Net Deferred Income Tax Assets	143,306	131,960
Deferred income tax (liabilities) related to:
Depreciation	(91,227)	(85,717)
Amortization of intangibles	(112,349)	(107,963)
Unremitted foreign earnings	(3,002)	(17,871)
Total Deferred Income Tax (Liabilities)	(206,578)	(211,551)
Deferred Income Tax Assets (Liabilities), Net	$ (63,272)	$ (79,591)