v3.26.1
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, 2026
May 31, 2025
May 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Asset impairments and write downs $ 10.9 $ 2.9 $ 10.0
Additions 0.0 85.3  
Fair Value, Nonrecurring | Inventory      
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 1.1  
Fair value of assets acquired 0.0 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 0.0
Asset impairments and write downs 4.3 1.2 3.0
Fair value of assets acquired 0.0 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
Asset impairments and write downs     3.1
Fair value of assets acquired     6.0
Fair Value, Nonrecurring | Other Assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of assets acquired 0.0    
Non cash write off related to assets held for sale 1.1    
Assets Held-for-sale, Long Lived, Fair Value Disclosure 0.0    
Fair Value, Nonrecurring | Investment in Film and Television Programs      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, FV 0.0    
Asset impairments and write downs 4.9    
Fair value of assets acquired 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 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 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
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 | Investment in Film and Television Programs      
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 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 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
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 | Investment in Film and Television Programs      
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 0.6 1.1  
Fair Value, Nonrecurring | Level 3 | Prepublication assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, FV 4.3 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
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 1.1    
Fair Value, Nonrecurring | Level 3 | Investment in Film and Television Programs      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, FV $ 4.9