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Unaudited Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Statement of Comprehensive Income [Abstract]        
Deferred gains (losses), tax $ 2,264 $ (2,265) $ (1,155) $ (2,945)
Reclassification adjustment on deferred (gains) losses included in net income, tax 1,195 (315) 2,520 (1,164)
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax $ 0 $ 0 $ 0 $ 0