Summary Consolidated Quarterly Financial Data (Unaudited) Summary Consolidated Quarterly Financial Data (Unaudited) (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
Quarterly Summary of Income Statement Data [Abstract]
Revenues	$ 1,044,534	$ 689,160	$ 516,004	$ 424,601	$ 632,826	$ 554,319	$ 373,681	$ 321,955	$ 2,674,299	$ 1,882,781	$ 1,475,881
Gross Profit	222,273	144,071	95,991	78,664	127,088	106,391	66,860	50,347
Income (loss) before income taxes	150,150	68,253	40,968	8,326	60,749	42,952	15,649	(6,408)	267,697	112,942	(29,366)
Net income	$ 94,905	$ 46,595	$ 24,674	$ 4,432	$ 411,417	$ 61,643	$ 16,872	$ (2,786)	$ 170,606	$ 487,146	$ 39,795
Earnings Per Share [Abstract]
Earnings Per Share, Basic	$ 0.56	$ 0.28	$ 0.15	$ 0.03	$ 2.44	$ 0.37	$ 0.10	$ (0.02)	$ 1.01	$ 2.91	$ 0.24
Earnings Per Share, Diluted	$ 0.54	$ 0.26	$ 0.14	$ 0.03	$ 2.35	$ 0.36	$ 0.10	$ (0.02)	$ 0.97	$ 2.86	$ 0.24
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
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
Weighted Average Number of Shares Outstanding, Diluted	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
Summary Consolidated Quarterly Financial Data (Textual) [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements				0			0