Restricted Cash - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Jul. 31, 2019	May 09, 2019	Oct. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	$ 29,800		$ 40,900
Restricted cash and cash equivalents - long-term	28,400		35,142
Reserves for obligations	$ 17,800		17,700
Letter of credit date of expiration	Aug. 31, 2028
Letters of credit outstanding, amount	$ 5,200		3,800
Bridgeport Fuel Cell Project [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 6,900	$ 15,000
Dominion Bridgeport FuelCell Park [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents - long-term			$ 15,000
Restricted cash and cash equivalents - long-term service agreement	15 years