Segment Data - Reconciliation from Earnings Before Income Taxes to Adjusted EBITDA from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022
Segment Reporting [Abstract]
Earnings before income taxes (EBIT)	$ 74,007	$ 160,286	$ 210,649
Less: net loss attributable to noncontrolling interest	(263)
Net earnings before income taxes attributable to controlling interest	74,270	160,286	210,649
Interest expense, net	1,587	18,298	23,852
EBIT (subtotal)	75,857	178,584	234,501
Corporate costs eliminated at Separation	19,343	41,479	48,020
Impairment of goodwill and long-lived assets	32,975	484
Restructuring and other expense (income), net	29,327	(367)	(2,616)
Separation costs	12,705	6,534
Non-cash charges in miscellaneous expense	19,180	4,774
Loss on investment in ArtiFlex		16,059
Loss on extinguishment of debt	1,534
Net gain on sale of assets in equity income	(2,780)	(2,063)
Pension settlement charge in equity income	1,040
Adjusted EBIT (subtotal)	189,181	245,484	279,905
Depreciation and amortization	48,663	45,975	42,645
Stock-based compensation	13,155	14,566	12,474
Adjusted EBITDA from continuing operations	$ 250,999	$ 306,025	$ 335,024