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Variable Interest Entity (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2013
Apr. 30, 2012
Variable Interest Entity [Line Items]    
Investment in EAM Trust (1) $ 57,465 $ 56,331
EAM Trust
   
Variable Interest Entity [Line Items]    
VIE Assets 59,141 57,482
Investment in EAM Trust (1) 57,465 [1] 56,331 [1]
Liabilities      
Maximum Exposure to Loss $ 57,465 $ 56,331
[1] Reported within Long Term Assets on the Consolidated Condensed Balance Sheets.