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Income Per Share Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2013
Apr. 30, 2012
Sep. 05, 2012
Zero Point Five Percent Exchangeable Senior Notes Due Two Thousand and Thirty Two [Member]
Apr. 30, 2013
Senior Notes Due Two Thousand Thirty-Two [Member] [Member]
Debt Instrument [Line Items]            
Net Income Attributable to Parent $ 24,674 $ 16,872 $ 29,106 $ 14,086    
Interest on Convertible Debt, Net of Tax 401    804       
Net Income Available to Common Stockholders, Diluted $ 25,075 $ 16,872 $ 29,910 $ 14,086    
Basic weighted-average shares 169,380 166,994 169,222 166,652    
Common stock equivalents 2,898 1,509 2,869 1,153    
Incremental Common Shares Attributable to Conversion of Debt Securities 5,858    5,858       
Diluted weighted-average shares 178,136 168,503 177,949 167,805    
Weighted-Average Number of Anti-Dilutive Options and RSU's 1,299 3,983 1,139 5,355    
Shares Issued under Stock Incentive and Employee Stock Purchase Plans 110 661 634 1,603    
Debt Instrument, Interest Rate, Stated Percentage         0.50% 0.50%