Significant Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	May 31, 2023	May 31, 2022
Deferred income tax assets related to:
Inventories	$ 18,811	$ 15,967
Accrued compensation and benefits	18,331	22,224
Accrued other expenses	21,037	21,782
Deferred income and other long-term liabilities	30,239	25,389
Credit and net operating and capital loss carryforwards	75,366	63,368
Net unrealized loss on securities	3,373	9,386
Research and development	17,360
Pension and other postretirement benefits	11,813	15,699
Total Deferred Income Tax Assets	196,330	173,815
Less: valuation allowances	(30,033)	(30,509)
Net Deferred Income Tax Assets	166,297	143,306
Deferred income tax (liabilities) related to:
Depreciation	(123,421)	(91,227)
Amortization of intangibles	(116,763)	(112,349)
Unremitted foreign earnings	(990)	(3,002)
Total Deferred Income Tax (Liabilities)	(241,174)	(206,578)
Deferred Income Tax Assets (Liabilities), Net	$ (74,877)	$ (63,272)