Postretirement Benefits - Weighted Average Assumptions Used in Calculations (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2012	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2011
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate used to determine present value of benefit obligation at end of year			4.10%	3.20%
Expected rate of increase in future compensation levels			3.50%	3.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate(A)	3.30%	4.20%	3.20%	4.10%	4.80%
Expected long-term rate of return on plan assets			8.00%	8.30%	8.50%
Expected rate of increase in future compensation levels			3.50%	3.50%	3.50%
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate used to determine present value of benefit obligation at end of year			4.10%	3.40%
Expected rate of increase in future compensation levels			0.00%	0.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate(A)			3.40%	4.20%	4.60%
Expected long-term rate of return on plan assets			8.00%	8.30%	8.50%
Expected rate of increase in future compensation levels			0.00%	0.00%	0.00%