Restricted Cash - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2019	Oct. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	$ 40,500	$ 40,900
Restricted cash and cash equivalents - long-term	34,863	35,142
Reserves for obligations	$ 17,400	17,700
Letter of credit date of expiration	Aug. 31, 2025
Letters of credit outstanding, amount	$ 2,600	3,800
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