Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
May 31, 2025	May 31, 2024	May 31, 2023
Basic and Diluted EPS:
Income from continuing operations	$ 12.5	$ 46.3	$ 89.8
Less: Income from discontinued operations			$ 0.4
Weighted Average Shares:
Weighted average common shares outstanding-basic	35,600,000	35,100,000	34,700,000
Additional shares from the assumed exercise of stock options	200,000	300,000	400,000
Weighted average common shares outstanding - diluted	35,800,000	35,400,000	35,100,000
Earnings per share - basic:
Earnings from continuing operations	$ 0.35	$ 1.3	$ 2.55
Income from discontinued operations			0.01
Earnings per share - basic	0.35	1.3	2.56
Earnings per share - diluted:
Earnings from continuing operations	0.35	1.29	2.52
Income from discontinued operations			0.01
Earnings per share - diluted	$ 0.35	$ 1.29	$ 2.53
Antidilutive shares excluded from the computation of diluted earnings per share (in shares)	151,000	0	197,300

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1