Significant Accounting Policies (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended		3 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010	Oct. 31, 2010 Reclassified	Jul. 31, 2010 Reclassified	Apr. 30, 2010 Reclassified	Jan. 31, 2010 Reclassified	Oct. 31, 2010 As reported	Jul. 31, 2010 As reported	Apr. 30, 2010 As reported	Jan. 31, 2010 As reported	Oct. 31, 2010 Change (decrease)	Jul. 31, 2010 Change (decrease)	Apr. 30, 2010 Change (decrease)	Jan. 31, 2010 Change (decrease)
Reclassification of the excess from interest and other income to cost of revenues
Cost of revenues	$ 339,947	$ 389,505	$ 898,266	$ 1,012,575	$ 363,983	$ 389,505	$ 305,583	$ 317,487	$ 367,152	$ 392,416	$ 305,739	$ 317,768	$ (3,169)	$ (2,911)	$ (156)	$ (281)
Interest and other	$ 5,494	$ 5,902	$ 13,168	$ 21,134	$ 7,179	$ 5,902	$ 6,999	$ 8,233	$ 10,348	$ 8,813	$ 7,155	$ 8,514	$ (3,169)	$ (2,911)	$ (156)	$ (281)
Significant Accounting Policies (Textuals) [Abstract]
Condition for accounting in investments as per equity method			Investments in 50% or less owned partnerships and affiliates are accounted for using the equity method unless it is determined that the Company has effective control of the entity, in which case the entity would be consolidated.