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Income Taxes - Activity Related to Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2025 | May 31, 2024 | May 31, 2023
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits, beginning balance | $ 4.4 | $ 2.9 | $ 5.7
Additions for tax positions of prior years | 0.2 | 3.4 | 0.1
Reductions for tax positions of prior years | (2.9) | (1.4) | (2.8)
Settlements |  | (0.5) |
Foreign currency translation | (0.1) |  | (0.1)
Unrecognized tax benefits, ending balance | $ 1.6 | $ 4.4 | $ 2.9

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