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Property, Plant and Equipment (Details) - USD ($)
12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Property, Plant and Equipment [Line Items]      
Total at cost $ 948,300,000 $ 895,800,000  
Less Accumulated depreciation and amortization 370,600,000 340,200,000  
Property, plant and equipment, net 577,700,000 555,600,000  
Asset impairments 900,000 11,200,000 $ 6,800,000
Depreciation and amortization expense 56,200,000 41,800,000 36,200,000
Land [Member]      
Property, Plant and Equipment [Line Items]      
Total at cost 79,100,000 78,900,000  
Building [Member]      
Property, Plant and Equipment [Line Items]      
Total at cost 239,100,000 240,000,000  
Capitalized software [Member]      
Property, Plant and Equipment [Line Items]      
Total at cost 204,000,000 158,700,000  
Furniture, fixtures and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total at cost 213,900,000 215,500,000  
Building and Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Total at cost 212,200,000 202,700,000  
Property capitalized 72,500,000 99,600,000  
Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, net 46,800,000.0 59,300,000.0  
Website Development [Member]      
Property, Plant and Equipment [Line Items]      
Asset impairments   11,000,000 $ (5,700,000)
Book Fair Trucks [Member]      
Property, Plant and Equipment [Line Items]      
Asset impairments   $ 200,000  
Legacy Building Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Asset impairments $ 900,000