Redeemable Preferred Stock - Additional Information (Details) $ / shares in Units, $ in Thousands			3 Months Ended						6 Months Ended
	Dec. 18, 2020 USD ($)	Mar. 31, 2005 shares	Apr. 30, 2021 USD ($) $ / shares shares	Apr. 30, 2021 CAD ($)	Apr. 30, 2020 USD ($)	Apr. 30, 2020 CAD ($)	Jan. 31, 2020 USD ($)	Jan. 31, 2020 CAD ($)	Apr. 30, 2021 USD ($) $ / shares shares	Apr. 30, 2021 CAD ($)	Apr. 30, 2020 USD ($)	Apr. 30, 2020 CAD ($)	Dec. 31, 2020 CAD ($)	Dec. 18, 2020 CAD ($)	Oct. 31, 2020 USD ($) shares	Oct. 31, 2020 CAD ($) shares
Class Of Stock [Line Items]
Preferred stock, par value | $ / shares			$ 0.01						$ 0.01
Derivative liability, fair value, gross liability					$ 600						$ 600
Maximum [Member]
Class Of Stock [Line Items]
Preferred stock, shares authorized | shares			250,000						250,000
Series B Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock, shares authorized | shares		105,875	105,875						105,875
Preferred stock, dividend rate, percentage		5.00%
Preferred stock, liquidation preference per share | $ / shares			$ 1,000.00						$ 1,000.00
Preferred stock, shares issued | shares			64,020						64,020						64,020	64,020
Preferred stock shares outstanding | shares			64,020						64,020						64,020	64,020
Temporary equity, carrying amount, attributable to parent			$ 59,857						$ 59,857						$ 59,857
Dividends, preferred stock, cash			$ 800		$ 800				$ 1,600		3,200
Series B Preferred Stock [Member] | Dividends Paid Date Represented [Member]
Class Of Stock [Line Items]
Dividends, preferred stock, cash											$ 2,400
Class A Preferred Shares [Member]
Class Of Stock [Line Items]
Preferred stock, shares issued | shares															1,000,000	1,000,000
Interest expense, other				$ 0		$ 700,000				$ 600,000		$ 1,300,000
Carrying value of preferred shares, total															$ 19,200
Increase in dividend rate annually									15.00%	15.00%
Aggregate amount of dividend payment										$ 500,000
Return of capital payments										$ 750,000
Loss resulted from revised fair value of preferred shares							$ 200	$ 200,000
Class A Preferred Shares [Member] | Minimum [Member]
Class Of Stock [Line Items]
Preferred stock, redemption date									Dec. 31, 2020	Dec. 31, 2020
Class A Preferred Shares [Member] | Maximum [Member]
Class Of Stock [Line Items]
Preferred stock, redemption date									Dec. 31, 2021	Dec. 31, 2021
Series 1 Preferred Shares [Member]
Class Of Stock [Line Items]
Carrying value of preferred shares, total																$ 25,600,000
Series 1 Preferred Shares [Member] | Enbridge Incorporation [Member]
Class Of Stock [Line Items]
Carrying value of preferred shares, total													$ 27,400,000
Accrued dividend													23,100,000
Preferred stock redemption amount													$ 4,300,000
Payment of amount owed														$ 27,400,000
Gains losses on extinguishment of debt	$ 900