Commitments and Contingencies (Details) (Ontario Grant [Member], CAD)	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Ontario Grant [Member]
Gain Contingencies [Line Items]
Grant amount	25,000,000
Grant period	November 1, 2010 to October 31, 2015
Annual disbursements	5,000,000
Benefit recorded to date	5,600,000	5,300,000
Grants receivable	2,500,000	300,000