Commitment & Contingencies - Long Term Contracts (Details)	12 Months Ended
	Oct. 31, 2011
Pipeline And Storage Capacity Contacts [Member] | Maximum [Member]
Long Term Purchase Commitment [Line Items]
Long Term Purchase Commitment Time Period	21
Pipeline And Storage Capacity Contacts [Member] | Minimum [Member]
Long Term Purchase Commitment [Line Items]
Long Term Purchase Commitment Time Period	1
Gas Supply Contracts [Member] | Maximum [Member]
Long Term Purchase Commitment [Line Items]
Long Term Purchase Commitment Time Period	2
Gas Supply Contracts [Member] | Minimum [Member]
Long Term Purchase Commitment [Line Items]
Long Term Purchase Commitment Time Period	1
Telecommunications And Technology Outsourcing Contracts [Member] | Maximum [Member]
Long Term Purchase Commitment [Line Items]
Long Term Purchase Commitment Time Period	3
Telecommunications And Technology Outsourcing Contracts [Member] | Minimum [Member]
Long Term Purchase Commitment [Line Items]
Long Term Purchase Commitment Time Period	1