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Property And Equipment (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Property, Plant and Equipment, Net [Abstract]      
Document Fiscal Year Focus 2017    
Depreciation and amortization expense of property and equipment $ 103.2 $ 100.8 $ 101.3