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Consolidated Statement of Stockholders' Equity (Parenthetical) (USD $)
 9 Months Ended
Jan. 31, 2014
Cash dividends declared, per share $ 0.32
Stock options exercised, shares 93,300
Stock options granted, shares 46,600
Treasury stock, shares 69,773
Additional Paid-in Capital [Member]
  
Stock options exercised, shares 93,300
Stock options granted, shares 46,600
Treasury Stock [Member]
  
Stock options exercised, shares 93,300
Treasury stock, shares 69,773
Retained Earnings [Member]
  
Cash dividends declared, per share $ 0.32