Significant Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	May 31, 2021	May 31, 2020
Deferred income tax assets related to:
Inventories	$ 12,189	$ 12,341
Allowance for losses		4,294
Accrued compensation and benefits	24,637	14,686
Accrued other expenses	28,511	15,107
Deferred income and other long-term liabilities	22,859	22,030
Credit and net operating and capital loss carryforwards	65,091	65,994
Net unrealized loss on securities	9,189	16,892
Pension and other postretirement benefits	34,180	76,147
Total Deferred Income Tax Assets	196,656	227,491
Less: valuation allowances	(64,696)	(66,855)
Net Deferred Income Tax Assets	131,960	160,636
Deferred income tax (liabilities) related to:
Depreciation	(85,717)	(70,588)
Amortization of intangibles	(107,963)	(109,926)
Unremitted foreign earnings	(17,871)	(8,781)
Total Deferred Income Tax (Liabilities)	(211,551)	(189,295)
Deferred Income Tax Assets (Liabilities), Net	$ (79,591)	$ (28,659)