Restricted Cash - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Jul. 31, 2017	Oct. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	$ 38,100	$ 34,100
Restricted cash and cash equivalents - long-term	33,480	24,692
Reserves for obligations	$ 17,000
Letter of credit date of expiration	Apr. 30, 2019
Letters of credit outstanding, amount	$ 2,900	7,900
Dominion Bridgeport FuelCell Park [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents - long-term	$ 15,000	$ 15,000
Debt instrument, term	15 years