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Share-Based Compensation Plans Employee stock purchase plan (Details) (USD $)	9 Months Ended
	Jul. 31, 2012
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Stock Issued During Period, Shares, Employee Stock Purchase Plans	223,687
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 0.90
Common Stock, Capital Shares Reserved for Future Issuance	774,373

Number of shares issued during the period as a result of an employee stock purchase plan.

Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.