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Equity Compensation Plans and Other Incentive Compensation - Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options Intrinsic Value (Detail) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2026 | May 31, 2025 | May 31, 2024
Share-Based Payment Arrangement [Abstract] |  |  |
Aggregate intrinsic value of options outstanding | $ 14.5 | $ 0.1 | $ 0.1
Aggregate intrinsic value of options exercisable | 0.4 | 0.0 | 0.0
Aggregate intrinsic value of options exerised | $ 0.4 | $ 0.0 | $ 0.0

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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