XML 69 R54.htm IDEA: XBRL DOCUMENT v3.20.2
Asset Write Down (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Feb. 29, 2020
May 31, 2020
May 31, 2019
May 31, 2018
Asset Impairment Charges [Abstract]        
Asset impairments and write downs $ 40.0 $ 40.6 $ 0.9 $ 11.2
Inventory, net of reserves 37.6      
Author advances 1.6      
Prepublication costs $ 0.8      
Class A Stock [Member]        
Class of Stock [Line Items]        
Impact on earnings per share (USD per share)   $ 0.84