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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($)
3 Months Ended 9 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Consolidated Statements Of Income        
Related party costs $ 1,900,000 $ 3,000,000 $ 7,400,000 $ 17,900,000