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Segment Information (Narrative) (Details) (USD $)
12 Months Ended
Apr. 30, 2011
Apr. 30, 2010
Apr. 30, 2009
Revenue from international operations $ 205,800,000 $ 190,900,000 $ 160,700,000
Pretax income from international operations 46,200,000 46,700,000 31,600,000
Assets 5,207,961,000 5,234,318,000 5,359,722,000
Foreign [Member]
     
Assets $ 206,300,000 $ 166,800,000 $ 126,800,000