Income Per Share Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2011	Sep. 05, 2012
Earnings Per Share [Abstract]
Net Income Attributable to Parent	$ 94,905	$ 46,595	$ 24,674	$ 4,432	$ 411,417	$ 61,643	$ 16,872	$ (2,786)	$ 170,606	$ 487,146	$ 39,795
Interest on Convertible Debt, Net of Tax									1,604	78
Net Income Available to Common Stockholders, Diluted									$ 172,210	$ 487,224	$ 39,795
Basic weighted-average shares	169,440,000	169,268,000	169,380,000	169,064,000	168,416,000	167,664,000	166,994,000	166,311,000	169,288,000	167,346,000	167,140,000
Common stock equivalents									2,817,000	1,996,000	1,241,000
Incremental Common Shares Attributable to Conversion of Debt Securities									5,858,000	812,000
Diluted weighted-average shares	177,952,000	178,001,000	178,136,000	171,903,000	174,775,000	170,229,000	168,503,000	166,311,000	177,963,000	170,154,000	168,381,000
Weighted average number of anti-dilutive options and RSUs									1,509,000	3,646,000	7,936,000
Shares issued under stock incentive and employee stock purchase plans									1,213,000	2,927,000	2,390,000
Incremental Common Shares Attributable to Anti-Dilutive Options											0
Debt Instrument, Interest Rate, Stated Percentage												0.50%
0.5% Exchangeable Senior Notes Due 2032 [Member]
Earnings Per Share [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	0.50%								0.50%			0.50%