Restricted Cash (Details) (USD $)	3 Months Ended
	Jan. 31, 2015	Oct. 31, 2014
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	$ 27,300,000	$ 25,100,000
Restricted cash and cash equivalents - long-term	21,642,000	19,600,000
Letter of Credit Date of Expiration	Apr. 01, 2019
Letters of Credit Outstanding, Amount	9,600,000	7,400,000
Dominion Bridgeport FuelCell Park [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents - long-term	$ 15,000,000
Debt Instrument, Term	15 years