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DODGE CITY LAND ACQUISITION (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Apr. 30, 2010
acre
Jun. 30, 2009
acre
DODGE CITY LAND ACQUISITION [Abstract]    
Area of land sold   104
Amount received by sale of land $ 2.0  
Cost incurred for the sale of land $ 1.5  
Area of land purchases 49