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Long-Term Debt (Tables)
12 Months Ended
Jul. 31, 2015
Long-term Debt, Excluding Current Maturities [Abstract]  
Schedule Of Long-Term Debt

Long-term debt consists of the following:

  2015   2014
  (thousands of dollars)
5.48% Unsecured senior notes, interest payable semi-annually,          
principal payment of $50.0 million due June 1, 2017    50,000       50,000 
5.48% Unsecured senior notes, interest payable semi-annually,          
principal payment of $25.0 million due September 28, 2017    25,000       25,000 
5.48% Unsecured senior notes, interest payable semi-annually,          
principal payment of $25.0 million due November 30, 2017    25,000       25,000 
3.72% Unsecured senior notes, interest payable semi-annually,          
  principal payment of $125.0 million due March 27, 2024    125,000       125,000 
2.93% Unsecured senior notes, interest payable semi-annually,          
  principal payment of $25.0 million due April 16, 2025    25,000       -
3.18% Unsecured senior notes, interest payable semi-annually,          
  principal payment of $125.0 million due June 17, 2030    125,000       -
Variable Rate Guaranteed senior note, interest payable quarterly,          
  principal payment of ¥1.65 billion due May 19, 2019 and an          
  interest rate of 0.52% as of July 31, 2015    13,313       16,051 
Capitalized lease obligations and other, with various maturity          
dates and interest rates    1,928       3,177 
Terminated interest rate swap contracts    826       1,236 
Total    391,067       245,464 
Less current maturities    1,849       1,738 
Total long-term debt $  389,218    $  243,726