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Schedule II Valuation and Qualifying Accounts and Reserves Schedule II (Details) - USD ($)
$ in Millions
 12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Allowance for doubtful accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 15.6 $ 18.0 $ 24.9
Expensed 10.6 7.3 5.8
Write-Offs and Other 11.3 9.7 12.7
Balance at End of Year 14.9 15.6 18.0
Reserve for returns      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 27.0 26.0 57.1
Expensed 53.9 56.5 48.3
Write-Offs and Other [1] 53.0 55.5 79.4
Balance at End of Year 27.9 27.0 26.0
Reserves for obsolescence      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 81.8 83.8 82.2
Expensed 21.7 23.7 26.2
Write-Offs and Other 22.4 25.7 24.6
Balance at End of Year 81.1 81.8 83.8
Reserve for royalty advances      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 85.3 79.5 75.6
Expensed 3.6 6.5 4.9
Write-Offs and Other 2.1 0.7 1.0
Balance at End of Year $ 86.8 $ 85.3 $ 79.5
[1] Represents actual returns charged to the reserve