Segment Operations - Financial Information for Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended					9 Months Ended
	Feb. 28, 2025		Feb. 29, 2024	Feb. 28, 2024		Feb. 28, 2025		Feb. 29, 2024	Feb. 28, 2024		May 31, 2024
Segment Reporting Information [Line Items]
Net sales	$ 304,524		$ 316,755			$ 835,878		$ 926,902	$ 926,902
Capital expenditures	12,704		10,017			37,494			39,840
Depreciation and amortization	11,950		11,949	$ 11,949		35,707			36,238
Restructuring and other expense, net	5,374	[1]	698	698	[1]	9,152	[1]		704	[1]
Separation costs			2,999	2,999				12,465	12,465
Equity income (loss)	32,081		43,235			102,129		127,328	127,328
Adjusted EBITDA from continuing operations	52,579		40,471	$ 40,471		120,478		$ 100,804	100,804
Total assets	1,682,004					1,682,004					$ 1,638,637
Unallocated Corporate and Other
Segment Reporting Information [Line Items]
Net sales			35,384						91,558
Capital expenditures	(516)		1,259			6,516			13,098
Depreciation and amortization	1,147		2,005			3,443			6,263
Restructuring and other expense, net	4,795		614			7,770
Separation costs			2,999						12,465
Equity income (loss)	(2,418)		(578)			(3,309)			3,296
Adjusted EBITDA from continuing operations	(8,033)		(11,837)			(23,556)			(23,209)
Total
Segment Reporting Information [Line Items]
Adjusted EBITDA from continuing operations	73,779		66,871			178,429			187,829
Total Reportable Segments
Segment Reporting Information [Line Items]
Net sales	304,524		281,371			835,878			835,344
Capital expenditures	12,188		8,758			30,978			26,742
Depreciation and amortization	10,803		9,944			32,264			29,975
Restructuring and other expense, net	579		84			1,382			704
Equity income (loss)	34,499		43,813			105,438			124,032
Adjusted EBITDA from continuing operations	81,812		78,708			201,985			211,038
Total assets	1,342,998					1,342,998					1,230,549
Total Reportable Segments | Consumer products
Segment Reporting Information [Line Items]
Net sales	139,714		133,181			374,057			369,923
Capital expenditures	8,775		4,806			19,508			10,533
Depreciation and amortization	4,277		3,960			12,872			12,065
Adjusted EBITDA from continuing operations	28,625		25,649			61,884			52,537
Total assets	588,872					588,872					557,826
Total Reportable Segments | Building Products
Segment Reporting Information [Line Items]
Net sales	164,810		148,190			461,821			465,421
Capital expenditures	3,413		3,952			11,470			16,209
Depreciation and amortization	6,526		5,984			19,392			17,910
Restructuring and other expense, net	579		84			1,382			704
Equity income (loss)	34,499		43,813			105,438			124,032
Adjusted EBITDA from continuing operations	53,187		$ 53,059			140,101			$ 158,501
Total assets	754,126					754,126					672,723
Unallocated Corporate and Other
Segment Reporting Information [Line Items]
Total assets	$ 339,006					$ 339,006					$ 408,088

[1] Reflects the change in fair value of the contingent liability associated with the Ragasco earnout arrangement covering the 12-month period ended December 31, 2024. See “Note N – Acquisitions” for additional information.