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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, 2024 | May 31, 2023 | May 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset impairments and write downs | $ 10.0 | $ 0.0 | $ 0.4
Fair Value, Nonrecurring | Prepublication assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV | 0.0 |  |
Asset impairments and write downs | 3.0 |  |
Fair value of assets acquired | 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 | 3.9 |  | 0.4
Fair value of assets acquired | 0.0 |  | 0.0
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 | 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 | Accounts Receivable |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  |  | 1.4
Asset impairments and write downs |  |  | 9.3
Fair value of assets acquired |  |  | 0.0
Fair Value, Nonrecurring | Inventory |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  |  | 2.3
Asset impairments and write downs |  |  | 1.6
Fair value of assets acquired |  |  | 0.0
Fair Value, Nonrecurring | Other Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  |  | 0.0
Asset impairments and write downs |  |  | 0.7
Fair value of assets acquired |  |  | 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 |  |
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 | Goodwill |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  | 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 | Accounts Receivable |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  |  | 0.0
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 | Other Assets |  |  |
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 |  |
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 | Goodwill |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  | 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 | Accounts Receivable |  |  |
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 | Other Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  |  | 0.0
Fair Value, Nonrecurring | Level 3 | Prepublication assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV | 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 | 3.9 |  | 0.0
Fair Value, Nonrecurring | Level 3 | Goodwill |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  | 7.6 |
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 | Accounts Receivable |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  |  | 1.4
Fair Value, Nonrecurring | Level 3 | Inventory |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  |  | 2.3
Fair Value, Nonrecurring | Level 3 | Other Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, FV |  |  | $ 0.0

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