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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) (USD $)
3 Months Ended 9 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2012
Jan. 31, 2011
Statement of Income and Comprehensive Income [Abstract]        
Tax effect of foreign currency translation adjustments $ 8,187 $ 10,147 $ 27,068 $ 32,837