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Business Combinations - Summary of Business Acquisition, Unaudited Pro Forma Information (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2026 | May 31, 2025 | May 31, 2024
Business Acquisition Pro Forma Information [Line Items] |  |  |
Operating income | $ (21.6) | $ (1,061.0) | $ 58.6

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