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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2013
Apr. 30, 2012
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]        
Realized loss (gains) on derivative instruments reclassified into operations, tax $ (251) $ 14 $ (597) $ 261
Unrealized (loss) gains on derivative instruments, tax $ 410 $ (114) $ (150) $ 873