Consolidated Statements of Operations (USD $) In Thousands, except Per 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
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
Cost of revenues									2,133,300	1,532,095	1,260,770
Selling, general and administrative									339,932	287,257	261,355
Total									2,473,232	1,819,352	1,522,125
Income (loss) from operations									201,067	63,429	(46,244)
Other:
Income (loss) from unconsolidated entities									14,392	23,592	(1,194)
Other income - net									52,238	25,921	23,403
Interest expense									0	0	(1,504)
Expenses related to early retirement of debt											(3,827)
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)
Income tax provision (benefit)									97,091	(374,204)	(69,161)
Net income	$ 94,905	$ 46,595	$ 24,674	$ 4,432	$ 411,417	$ 61,643	$ 16,872	$ (2,786)	$ 170,606	$ 487,146	$ 39,795
Income (loss) 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
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:
Basic	169,440	169,268	169,380	169,064	168,416	167,664	166,994	166,311	169,288	167,346	167,140
Diluted	177,952	178,001	178,136	171,903	174,775	170,229	168,503	166,311	177,963	170,154	168,381