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Acquisitions (Details)
$ in Millions
12 Months Ended
May 31, 2018
USD ($)
business
May 31, 2017
USD ($)
May 31, 2016
USD ($)
Business Acquisition [Line Items]      
Intangible assets acquired $ 3.3 $ 7.0  
Acquisition related payments net of cash acquired $ 4.4 10.1 $ 3.7
Ooka Island, Inc. [Member]      
Business Acquisition [Line Items]      
Equity interest acquired (percent) 100.00%    
Acquisition related payments net of cash acquired $ 9.7    
Net assets acquired 6.9    
Intangible assets acquired 6.8    
Goodwill expected to be deductible $ 2.8    
U.S. Based Book Fair Business [Member]      
Business Acquisition [Line Items]      
Number of businesses acquired | business 2    
Intangible assets acquired $ 1.8 $ 0.2  
Acquisition related payments net of cash acquired 0.4    
Intangible assets acquired 0.2    
U.K. Based Book Business [Member]      
Business Acquisition [Line Items]      
Intangible assets acquired $ 1.5