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Cash Flow Information (Tables)
 3 Months Ended
Oct. 31, 2016
Supplemental Cash Flow Elements [Abstract]  
Schedule of cash flow information
                     Supplemental disclosure: Three Months Ended
October 31
2016       2015
Interest paid, net of capitalized interest of $2,742 (2016)
       and $11,348 (2015) $      61,994 $      64,690
Income taxes paid $ 50,946 $ 231,654