FINANCIAL INSTRUMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2009	Oct. 31, 2011 Treasury lock agreement based on U.S. Treasury security Cash flow hedges.	Oct. 31, 2010 Treasury lock agreement based on U.S. Treasury security Cash flow hedges.	Apr. 30, 2007 Treasury lock agreement based on U.S. Treasury security Cash flow hedges. agreement	Apr. 30, 2007 Treasury lock agreement based on U.S. Treasury security, one and two Cash flow hedges.	Apr. 30, 2007 Treasury lock agreement based on U.S. Treasury security, three Cash flow hedges.
Treasury lock agreements
Number of treasury lock agreements						3
Principal balance							$ 30,000	$ 40,000
Net settlement of unrecognized loss portion recorded in accumulated other comprehensive loss	2,671	300	(11,512)
Amount of unrecognized loss portion in accumulated other comprehensive loss	$ (122)	$ (2,793)	$ (3,093)	$ 155	$ 161	$ 182