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Income Taxes (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Income Taxes (Additional Textual) [Abstract]        
Undistributed earnings of foreign subsidiaries on which deferred income taxes not provided $ 248.6      
Time period over which it is reasonably possible that the Company could decrease its unrecognized tax benefits 12 months      
Amount unrecognized tax benefit could decrease in next 12 months $ 2.1      
Company's unrecognized tax benefits 45.0 $ 29.1 $ 29.7 $ 24.0
Unrecognized tax benefits that would affect the effective tax rate 32.2 19.5 20.6  
Tax-related net interest and penalties 3.4 2.0 2.0  
Interest charged to earnings 0.7 $ 0.1 $ 0.3  
Federal [Member]        
Schedule Of Tax Carryforwards [Line Items]        
Valuation allowance on operating loss carryforward $ 4.2