Consolidated Statements of Earnings - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Feb. 28, 2026	Nov. 30, 2025	Aug. 31, 2025	Feb. 28, 2025	Nov. 30, 2024	Aug. 31, 2024	Feb. 28, 2026	Feb. 28, 2025	May 31, 2025
Income Statement [Abstract]
Net sales	$ 769.8			$ 687.4			$ 2,514.6	$ 2,260.4
Cost of goods sold	693.7			606.2			2,230.1	1,998.8
Gross margin	76.1			81.2			284.5	261.6
Selling, general and administrative expense	77.5			54.6			216.3	172.7
Impairment of assets	1.5	$ 0.6		7.4			2.1	7.4
Restructuring and other (income),) expense, net	(6.0)			0.9			(7.0)	0.9
Operating income	3.1			18.3			73.1	80.6
Other income (expense):
Miscellaneous income (expense), net	9.8			0.2			9.9	(1.9)
Interest expense, net	(2.1)			(1.4)			(7.7)	(6.1)
Equity in net income of unconsolidated affiliate	3.5			0.0			16.7	0.4
Earnings before income taxes	14.3			17.1			92.0	73.0
Income tax expense	3.5			5.0			21.1	12.6
Net earnings	10.8			12.1	$ 16.1	$ 32.2	70.9	60.4
Net earnings (loss) attributable to noncontrolling interests	0.4			(1.7)			4.9	5.4
Net earnings attributable to controlling interest	$ 10.4			$ 13.8			$ 66.0	$ 55.0
Basic
Weighted average common shares outstanding	49,900,000			49,500,000			49,800,000	49,500,000
Earnings per share attributable to controlling interest	$ 0.21			$ 0.28			$ 1.33	$ 1.11
Diluted
Weighted average common shares outstanding	50,900,000			50,500,000			50,700,000	50,500,000
Earnings per share attributable to controlling interest	$ 0.2			$ 0.27			$ 1.3	$ 1.09
Common shares outstanding at end of period	49,910,958			49,500,000			49,910,958	49,500,000	49,548,895
Cash dividends declared per share	$ 0.16	$ 0.16	$ 0.16	$ 0.16	$ 0.16	$ 0.16	$ 0.48	$ 0.48