Redeemable Preferred Stock - Additional Information (Details) $ / shares in Units, $ in Thousands, $ in Millions		3 Months Ended		6 Months Ended			12 Months Ended
	Nov. 01, 2017 USD ($) Installment	Apr. 30, 2018 USD ($) $ / shares shares	Apr. 30, 2017 USD ($)	Apr. 30, 2018 USD ($) TradingDay $ / shares shares	Apr. 30, 2018 CAD ($) TradingDay shares	Apr. 30, 2017 USD ($)	Oct. 31, 2017 CAD ($) shares	Apr. 30, 2018 CAD ($) shares	Oct. 31, 2017 USD ($) $ / shares shares	Oct. 31, 2017 CAD ($) shares
Class Of Stock [Line Items]
Preferred stock, shares authorized | shares		250,000		250,000				250,000
Preferred stock, par value | $ / shares		$ 0.01		$ 0.01
Convertible preferred stock, reduction in carrying amount | $				$ 15,600
Series B Cumulative Convertible Perpetual Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock, shares authorized | shares		105,875		105,875				105,875	105,875	105,875
Preferred stock, dividend rate, percentage				5.00%	5.00%		5.00%
Preferred stock, shares issued | shares		64,020		64,020				64,020	64,020	64,020
Preferred stock, shares outstanding | shares		64,020		64,020				64,020	64,020	64,020
Temporary equity, carrying amount, attributable to parent | $		$ 59,857		$ 59,857					$ 59,857
Preferred stock, liquidation preference per share | $ / shares		$ 1,000.00		$ 1,000.00					$ 1,000.00
Dividends, preferred stock, cash | $				$ 1,600		$ 1,600
Series C Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock, dividend rate, percentage				15.00%	15.00%
Temporary equity, carrying amount, attributable to parent | $		$ 12,102		$ 12,102					$ 27,700
Convertible preferred stock, converted into common stock | shares				18,752	18,752
Conversion of stock conversion price | $ / shares		$ 1.84		$ 1.84
Preferred stock deemed dividends | $		$ 4,199	$ 0	$ 7,662		$ 0
Preferred stock redemption terms				Installment Payments. On November 1, 2017 and on the sixteenth day and first day of each calendar month thereafter until March 1, 2019, subject to extension in certain circumstances (the “Maturity Date”), inclusive, the Company will redeem the stated value of Series C Preferred Shares in thirty-three equal installments of $1.0 million (each bimonthly amount, an “Installment Amount” and the date of each such payment, an “Installment Date”). The holders will have the ability to defer installment payments, but not beyond the Maturity Date. In addition, during each period commencing on the 11th trading day prior to an Installment Date and prior to the immediately subsequent Installment Date, the holders may elect to accelerate the conversion of Series C Preferred Shares at the then applicable installment conversion price, provided that the holders may not elect to effect any such acceleration during such installment period if either (a) in the aggregate, all the accelerations in such installment period exceed the sum of three other Installment Amounts, or (b) the number of Series C Preferred Shares subject to prior accelerations exceeds in the aggregate twelve Installment Amounts.	Installment Payments. On November 1, 2017 and on the sixteenth day and first day of each calendar month thereafter until March 1, 2019, subject to extension in certain circumstances (the “Maturity Date”), inclusive, the Company will redeem the stated value of Series C Preferred Shares in thirty-three equal installments of $1.0 million (each bimonthly amount, an “Installment Amount” and the date of each such payment, an “Installment Date”). The holders will have the ability to defer installment payments, but not beyond the Maturity Date. In addition, during each period commencing on the 11th trading day prior to an Installment Date and prior to the immediately subsequent Installment Date, the holders may elect to accelerate the conversion of Series C Preferred Shares at the then applicable installment conversion price, provided that the holders may not elect to effect any such acceleration during such installment period if either (a) in the aggregate, all the accelerations in such installment period exceed the sum of three other Installment Amounts, or (b) the number of Series C Preferred Shares subject to prior accelerations exceeds in the aggregate twelve Installment Amounts.
Preferred stock redemption maturity date				Mar. 01, 2019	Mar. 01, 2019
Number of preferred stock redemption equal installments | Installment	33
Redemption of preferred shares in installments, each installment amount | $	$ 1,000
Common stock consecutive trading day | TradingDay				10	10
Repayment percentage of installment amount				108.00%	108.00%
Preferred shares, triggering event redemption terms				Redemption. In the event of a triggering event, as defined in the Certificate of Designations, the holders of the Series C Preferred Shares can force redemption at a price equal to the greater of (a) the conversion amount to be redeemed multiplied by 125% and (b) the product of (i) the conversion rate with respect to the conversion amount in effect at such time as such holder delivers a triggering event redemption notice multiplied by (ii) the greatest closing sale price of the common stock on any trading day during the period commencing on the date immediately preceding such triggering event and ending on the date the Company makes the entire payment required.	Redemption. In the event of a triggering event, as defined in the Certificate of Designations, the holders of the Series C Preferred Shares can force redemption at a price equal to the greater of (a) the conversion amount to be redeemed multiplied by 125% and (b) the product of (i) the conversion rate with respect to the conversion amount in effect at such time as such holder delivers a triggering event redemption notice multiplied by (ii) the greatest closing sale price of the common stock on any trading day during the period commencing on the date immediately preceding such triggering event and ending on the date the Company makes the entire payment required.
Redemption pice percentage				125.00%	125.00%
Preferred shares voting rights				no voting rights	no voting rights
Series C Preferred Stock [Member] | Volume Weighted Average Price [Member]
Class Of Stock [Line Items]
Percentage of common stock on trading day immediately prior to applicable installment date				87.50%	87.50%
Series C Preferred Stock [Member] | Arithmetic Average Of Two Lowest Volume Weighted Average Price [Member]
Class Of Stock [Line Items]
Percentage of common stock on trading day immediately prior to applicable installment date				87.50%	87.50%
Series C Preferred Stock [Member] | Convertible Preferred Offering [Member]
Class Of Stock [Line Items]
Aggregate number of shares issued | shares							33,500
Sale of stock price per share | $ / shares									$ 0.01
Preferred stock, stated value per share | $ / shares									$ 1,000
Preferred stock, shares issued | shares		14,548		14,548				14,548	33,300	33,300
Preferred stock, shares outstanding | shares		14,548		14,548				14,548	33,300	33,300
Temporary equity, carrying amount, attributable to parent | $		$ 12,100		$ 12,100					$ 27,700
Conversion of stock conversion price | $ / shares		$ 1.84		$ 1.84
Convertible preferred stock, terms of conversion				Conversion Rights. The Series C Preferred Shares are convertible into shares of common stock subject to the beneficial ownership limitations provided in the Certificate of Designations for Series C Preferred Stock (the “Certificate of Designations”), at a conversion price equal to $1.84 per share of common stock (“Conversion Price”), subject to adjustment as provided in the Certificate of Designations, at any time at the option of the holder. In the event of a triggering event, as defined in the Certificate of Designations, the Series C Preferred Shares are convertible into shares of common stock at a conversion price of the lower of $1.84 per share and 85% of the lowest volume weighted average price (“VWAP”) of the common stock of the five trading days immediately prior to delivery of the applicable conversion notice. The holders will be prohibited from converting Series C Preferred Shares into shares of common stock if, as a result of such conversion, such holder, together with its affiliates, would own more than 8.99% of the total number of shares of common stock then issued and outstanding. Each holder has the right to increase its maximum percentage up to 9.99% upon 60 days’ notice to the Company.	Conversion Rights. The Series C Preferred Shares are convertible into shares of common stock subject to the beneficial ownership limitations provided in the Certificate of Designations for Series C Preferred Stock (the “Certificate of Designations”), at a conversion price equal to $1.84 per share of common stock (“Conversion Price”), subject to adjustment as provided in the Certificate of Designations, at any time at the option of the holder. In the event of a triggering event, as defined in the Certificate of Designations, the Series C Preferred Shares are convertible into shares of common stock at a conversion price of the lower of $1.84 per share and 85% of the lowest volume weighted average price (“VWAP”) of the common stock of the five trading days immediately prior to delivery of the applicable conversion notice. The holders will be prohibited from converting Series C Preferred Shares into shares of common stock if, as a result of such conversion, such holder, together with its affiliates, would own more than 8.99% of the total number of shares of common stock then issued and outstanding. Each holder has the right to increase its maximum percentage up to 9.99% upon 60 days’ notice to the Company.
Percentage of lowest volume weighted average price of common stock considered as conversion price				85.00%	85.00%
Conversion terms, increase beneficial ownership limitation percentage upon notice periods				60 days	60 days
Series C Preferred Stock [Member] | Convertible Preferred Offering [Member] | Minimum [Member]
Class Of Stock [Line Items]
Conversion terms, beneficial ownership limitation, percentage				8.99%	8.99%
Series C Preferred Stock [Member] | Convertible Preferred Offering [Member] | Maximum [Member]
Class Of Stock [Line Items]
Conversion terms, beneficial ownership increase, percentage				9.99%	9.99%
Class A Cumulative Redeemable Exchangeable Preferred Shares [Member]
Class Of Stock [Line Items]
Preferred stock, shares outstanding | shares		1,000,000		1,000,000				1,000,000
Return of capital and dividend payments | $					$ 0.5		$ 0.5
Interest expense, other | $					$ 1.4		$ 1.3
Carrying value of preferred shares, total		$ 15,700		$ 15,700				$ 20.1	$ 15,100	$ 19.4