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Other Noncurrent Assets And Liabilities (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Other Noncurrent Assets And Liabilities [Abstract]    
Obligation under deferred compensation plans $ 42.5 $ 48.0
Cash surrender value of life insurance and other assets held under trusts 17.8 99.0
Life insurance and other asset held under trust, cash value of policy redemptions 81.1  
Assets held by trust, current   81.4
Assets held-in-trust, noncurrent   $ 17.6