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Consolidated Statement of Stockholders' Equity (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 6 Months Ended
Oct. 31, 2013
Cash dividends declared, per share $ 0.21
Stock options exercised, shares 66,200
Stock options granted, shares 46,600
Treasury stock, shares 47,654
Additional Paid-in Capital [Member]
  
Stock options exercised, shares 66,200
Stock options granted, shares 46,600
Treasury Stock [Member]
  
Stock options exercised, shares 66,200
Treasury stock, shares 47,654
Retained Earnings [Member]
  
Cash dividends declared, per share $ 0.21