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Goodwill and Other Intangibles (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Goodwill and Other Intangibles (Details) [Line Items]      
Additions due to acquisition $ 2.4 $ 0.8  
Amortization expense $ 2.2 $ 1.9 $ 2.0
Useful life of intangible assets 4 years    
Finite-Lived Intangible Assets [Member] | U.S. Based Book Fair Business [Member]      
Goodwill and Other Intangibles (Details) [Line Items]      
Additions due to acquisition $ 0.5    
Finite-Lived Intangible Assets [Member] | Troubadour, Limited [Member]      
Goodwill and Other Intangibles (Details) [Line Items]      
Additions due to acquisition $ 1.9