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Schedule II Valuation and Qualifying Accounts and Reserves Schedule II (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2017
May 31, 2016
May 31, 2015
Allowance for doubtful accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 16.1 $ 14.9 $ 15.6
Expensed 11.0 12.3 10.6
Write-Offs and Other 13.4 11.1 11.3
Balance at End of Year 13.7 16.1 14.9
Reserve For Return [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 32.1 27.9 27.0
Expensed 80.4 56.6 53.9
Write-Offs and Other [1] 76.2 52.4 53.0
Balance at End of Year 36.3 32.1 27.9
Reserves for obsolescence [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 73.9 81.1 81.8
Expensed 16.0 12.0 21.7
Write-Offs and Other 18.0 19.2 22.4
Balance at End of Year 71.9 73.9 81.1
Reserve for royalty advances [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 90.1 86.8 85.3
Expensed 4.3 4.1 3.6
Write-Offs and Other 0.6 0.8 2.1
Balance at End of Year $ 93.8 $ 90.1 $ 86.8
[1] Represents actual returns charged to the reserve