Income Per Share Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012	Sep. 05, 2012 Zero Point Five Percent Exchangeable Senior Notes Due Two Thousand and Thirty Two [Member]	Jul. 31, 2013 Senior Notes Due Two Thousand Thirty-Two [Member]
Debt Instrument [Line Items]
Net Income Attributable to Parent	$ 46,595	$ 61,643	$ 75,701	$ 75,729
Interest on Convertible Debt, Net of Tax	404		1,208
Net Income Available to Common Stockholders, Diluted	$ 46,999	$ 61,643	$ 76,909	$ 75,729
Basic weighted-average shares	169,268	167,664	169,237	166,990
Common stock equivalents	2,875	2,565	2,871	1,623
Incremental Common Shares Attributable to Conversion of Debt Securities	5,858		5,858
Diluted weighted-average shares	178,001	170,229	177,966	168,613
Weighted-Average Number of Anti-Dilutive Options and RSU's	1,198	3,279	1,159	4,663
Shares Issued under Stock Incentive and Employee Stock Purchase Plans	94	666	728	2,269
Debt Instrument, Interest Rate, Stated Percentage					0.50%	0.50%