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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, 2022 | May 31, 2021 | May 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Non cash write off related to assets held for sale | $ 11.6 | $ 0.0 | $ 0.0
Additions | 0.0 | 0.0 |
Intangible assets acquired | 0.0 | 0.0 |
Fair Value, Nonrecurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Property, plant and equipment, net |  | 0.0 | 0.0
Non cash write off related to assets held for sale |  | 1.5 | 0.6
Author advances |  |  | 0.0
Author Advances, Property, plant and equipment, net |  |  | 1.6
Prepublication assets |  |  | 0.5
Prepublication costs |  |  | 0.8
Intangible assets |  |  | 1.5
Impairment, Intangible assets |  |  | 0.0
Operating Lease, Right-Of-Use Asset, Fair Value Disclosure | 0.0 | 8.1 |
Fair Value, Nonrecurring | Inventories |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Non cash write off related to assets held for sale | 1.6 |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 2.3 |  |
Fair Value, Nonrecurring | Other Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Non cash write off related to assets held for sale | 0.7 |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 0.0 |  |
Fair Value, Nonrecurring | Accounts Receivable |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Non cash write off related to assets held for sale | 9.3 |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 1.4 |  |
Fair Value, Nonrecurring | Operating lease right-of-use assets, net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset Impairment Charges | 0.4 | 9.6 |
Additions | 0.0 | 0.0 |
Intangible assets acquired | 0.0 | 0.0 |
Fair Value, Nonrecurring | Property, plant and equipment, net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Additions |  | 0.0 | 0.0
Intangible assets acquired |  | 0.0 | 0.0
Fair Value, Nonrecurring | Prepublication assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Additions |  |  | 0.0
Intangible assets acquired |  |  | 0.0
Fair Value, Nonrecurring | Intangible assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Intangible assets acquired |  |  | 1.6
Fair Value, Nonrecurring | Other Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Additions | 0.0 |  |
Intangible assets acquired | 0.0 |  |
Fair Value, Nonrecurring | Accounts Receivable |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Additions | 0.0 |  |
Intangible assets acquired | 0.0 |  |
Fair Value, Nonrecurring | Inventories |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Additions | 0.0 |  |
Intangible assets acquired | 0.0 |  |
Fair Value, Nonrecurring | Author Advance |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Additions |  |  | 0.0
Intangible assets acquired |  |  | 0.0
Fair Value, Nonrecurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Property, plant and equipment, net |  | 0.0 | 0.0
Author advances |  |  | 0.0
Prepublication assets |  |  | 0.0
Intangible assets |  |  | 0.0
Operating Lease, Right-Of-Use Asset, Fair Value Disclosure | 0.0 | 0.0 |
Fair Value, Nonrecurring | Level 1 | Inventories |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 0.0 |  |
Fair Value, Nonrecurring | Level 1 | Other Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 0.0 |  |
Fair Value, Nonrecurring | Level 1 | Accounts Receivable |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 0.0 |  |
Fair Value, Nonrecurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Property, plant and equipment, net |  | 0.0 | 0.0
Author advances |  |  | 0.0
Prepublication assets |  |  | 0.0
Intangible assets |  |  | 0.0
Operating Lease, Right-Of-Use Asset, Fair Value Disclosure | 0.0 | 0.0 |
Fair Value, Nonrecurring | Level 2 | Inventories |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 0.0 |  |
Fair Value, Nonrecurring | Level 2 | Other Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 0.0 |  |
Fair Value, Nonrecurring | Level 2 | Accounts Receivable |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 0.0 |  |
Fair Value, Nonrecurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Property, plant and equipment, net |  | 0.0 | 0.0
Author advances |  |  | 0.0
Prepublication assets |  |  | 0.5
Intangible assets |  |  | $ 1.6
Operating Lease, Right-Of-Use Asset, Fair Value Disclosure | 0.0 | $ 9.1 |
Fair Value, Nonrecurring | Level 3 | Inventories |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 2.3 |  |
Fair Value, Nonrecurring | Level 3 | Other Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | 0.0 |  |
Fair Value, Nonrecurring | Level 3 | Accounts Receivable |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets Held-for-sale, Long Lived, Fair Value Disclosure | $ 1.4 |  |

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