Income Per Share Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	Sep. 05, 2012 Zero Point Five Percent Exchangeable Senior Notes Due Two Thousand and Thirty Two [Member]
Debt Instrument [Line Items]
Net Income Attributable to Parent	$ 65,222	$ 24,674	$ 110,802	$ 29,106
Interest on Convertible Debt, Net of Tax	392	401	789	804
Net Income Available to Common Stockholders, Diluted	$ 65,614	$ 25,075	$ 111,591	$ 29,910
Basic weighted-average shares	178,082	169,380	177,278	169,222
Common stock equivalents	2,502	2,898	2,529	2,869
Incremental Common Shares Attributable to Conversion of Debt Securities	5,858	5,858	5,858	5,858
Diluted weighted-average shares	186,442	178,136	185,665	177,949
Weighted-Average Number of Anti-Dilutive Options and RSU's	1,249	1,299	1,426	1,139
Shares Issued under Stock Incentive and Employee Stock Purchase Plans	212	110	1,225	634
Debt Instrument, Interest Rate, Stated Percentage					0.50%