Restricted Cash - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Jul. 31, 2018	Oct. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	$ 38,600	$ 38,200
Restricted cash and cash equivalents - long-term	33,289	33,526
Reserves for obligations	$ 17,500	17,000
Letter of credit date of expiration	Apr. 30, 2019
Letters of credit outstanding, amount	$ 2,300	2,900
Dominion Bridgeport FuelCell Park [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents - long-term	$ 15,000	$ 15,000
Restricted cash and cash equivalents - long-term service agreement	15 years