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Fair Value Measurements - Schedule of non-financial assets measured and recorded at fair value on a non-recurring basis (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2025 | May 31, 2024 | May 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset impairments and write downs | $ 2.9 | $ 10.0 | $ 0.0
Additions | 85.3 | 6.0 |
Fair Value, Nonrecurring | Inventory |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV | 0.0 |  |
Asset impairments and write downs | 1.1 |  |
Fair value of assets acquired | 0.0 |  |
Fair Value, Nonrecurring | Prepublication assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV | 0.0 | 0.0 |
Asset impairments and write downs | 1.2 | 3.0 |
Fair value of assets acquired | 0.0 | 0.0 |
Fair Value, Nonrecurring | Operating lease right-of-use assets, net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV | 0.0 | 0.0 |
Asset impairments and write downs | 0.6 | 3.9 |
Fair value of assets acquired | 0.0 | 0.0 |
Fair Value, Nonrecurring | Intangible assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  | 5.5 | 3.6
Asset impairments and write downs |  | 3.1 | 0.0
Fair value of assets acquired |  | 6.0 | 4.1
Fair Value, Nonrecurring | Goodwill |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  |  | 7.6
Asset impairments and write downs |  |  | 0.0
Fair value of assets acquired |  |  | 7.6
Fair Value, Nonrecurring | Level 1 | Inventory |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV | 0.0 |  |
Fair Value, Nonrecurring | Level 1 | Prepublication assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV | 0.0 | 0.0 |
Fair Value, Nonrecurring | Level 1 | Operating lease right-of-use assets, net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV | 0.0 | 0.0 |
Fair Value, Nonrecurring | Level 1 | Intangible assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  | 0.0 | 0.0
Fair Value, Nonrecurring | Level 1 | Goodwill |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  |  | 0.0
Fair Value, Nonrecurring | Level 2 | Inventory |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV | 0.0 |  |
Fair Value, Nonrecurring | Level 2 | Prepublication assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV | 0.0 | 0.0 |
Fair Value, Nonrecurring | Level 2 | Operating lease right-of-use assets, net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV | 0.0 | 0.0 |
Fair Value, Nonrecurring | Level 2 | Intangible assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  | 0.0 | 0.0
Fair Value, Nonrecurring | Level 2 | Goodwill |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  |  | 0.0
Fair Value, Nonrecurring | Level 3 | Inventory |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV | 1.1 |  |
Fair Value, Nonrecurring | Level 3 | Prepublication assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV | 1.2 | 3.0 |
Fair Value, Nonrecurring | Level 3 | Operating lease right-of-use assets, net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV | $ 0.6 | 3.9 |
Fair Value, Nonrecurring | Level 3 | Intangible assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  | $ 6.0 | 4.1
Fair Value, Nonrecurring | Level 3 | Goodwill |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  |  | $ 7.6

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