Significant Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	May 31, 2020	May 31, 2019
Deferred income tax assets related to:
Inventories	$ 12,341	$ 8,970
Allowance for losses	4,294	7,524
Accrued compensation and benefits	14,686	14,364
Accrued other expenses	15,107	17,036
Other long-term liabilities	22,030	15,947
Credit and net operating and capital loss carryforwards	65,994	63,395
Net unrealized loss on securities	16,892	12,391
Pension and other postretirement benefits	76,147	42,991
Total Deferred Income Tax Assets	227,491	182,618
Less: valuation allowances	(66,855)	(55,274)
Net Deferred Income Tax Assets	160,636	127,344
Deferred income tax (liabilities) related to:
Depreciation	(70,588)	(72,387)
Amortization of intangibles	(109,926)	(116,097)
Unremitted foreign earnings	(8,781)	(18,795)
Total Deferred Income Tax (Liabilities)	(189,295)	(207,279)
Deferred Income Tax Assets (Liabilities), Net	$ (28,659)	$ (79,935)