Segment Operations - Financial Information for Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2024	Nov. 30, 2023	May 31, 2024
Segment Reporting Information [Line Items]
Net sales	$ 274,046	$ 298,229	$ 531,354	$ 610,147
Capital expenditures	15,161	32,876	24,790	62,174
Depreciation and amortization	11,927	12,215	23,757	24,290
Restructuring and other expense, net	2,620	6	3,778	6
Separation costs		7,056		9,466
Miscellaneous income (expense), net	65	714	551	1,013
Loss on extinguishment of debt				1,534
Equity income	34,556	38,668	70,048	84,092
Adjusted EBITDA from continuing operations	37,109	24,543	67,899	60,333
Total assets of continuing operations	1,657,017		1,657,017		$ 1,638,637
Total assets of continuing operations	1,657,017		1,657,017		1,638,637
Unallocated Corporate and Other
Segment Reporting Information [Line Items]
Net sales		27,537		56,174
Capital expenditures	5,024	21,695	6,000	44,190
Depreciation and amortization	1,135	2,176	2,295	4,261
Restructuring and other expense, net	2,106		2,975
Separation costs		7,056		9,466
Equity income	262	3,492	(892)	3,873
Adjusted EBITDA from continuing operations	(6,456)	(3,439)	(15,524)	(11,373)
Total
Segment Reporting Information [Line Items]
Adjusted EBITDA from continuing operations	56,213	55,044	104,649	120,958
Total Reportable Segments
Segment Reporting Information [Line Items]
Net sales	274,046	270,692	531,354	553,973
Capital expenditures	10,137	11,181	18,790	17,984
Depreciation and amortization	10,792	10,039	21,462	20,029
Restructuring and other expense, net	514	6	803	6
Equity income	34,294	35,176	70,940	80,219
Adjusted EBITDA from continuing operations	62,669	58,483	120,173	132,331
Total assets of continuing operations	1,339,479		1,339,479		1,230,549
Total Reportable Segments | Consumer products
Segment Reporting Information [Line Items]
Net sales	116,748	119,389	234,343	236,742
Capital expenditures	5,789	4,194	10,733	5,727
Depreciation and amortization	4,296	4,112	8,595	8,104
Adjusted EBITDA from continuing operations	15,484	12,674	33,259	26,889
Total assets of continuing operations	574,568		574,568		557,826
Total Reportable Segments | Building Products
Segment Reporting Information [Line Items]
Net sales	157,298	151,303	297,011	317,231
Capital expenditures	4,348	6,987	8,057	12,257
Depreciation and amortization	6,496	5,927	12,867	11,925
Restructuring and other expense, net	514	6	803	6
Equity income	34,294	35,176	70,940	80,219
Adjusted EBITDA from continuing operations	47,185	$ 45,809	86,914	$ 105,442
Total assets of continuing operations	764,911		764,911		672,723
Unallocated Corporate and Other
Segment Reporting Information [Line Items]
Total assets of continuing operations	$ 317,538		$ 317,538		$ 408,088