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Redeemable Preferred Stock - Additional Information (Details) $ / shares in Units, $ in Thousands, $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
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Nov. 01, 2017 USD ($) Installment | Jul. 31, 2018 USD ($) $ / shares shares | Jul. 31, 2017 USD ($) | Jul. 31, 2018 USD ($) TradingDay $ / shares shares | Jul. 31, 2018 CAD ($) TradingDay shares | Jul. 31, 2017 USD ($) | Jul. 31, 2017 CAD ($) | Oct. 31, 2017 USD ($) $ / shares shares | Aug. 27, 2018 $ / shares | Jul. 31, 2018 CAD ($) shares | Oct. 31, 2017 CAD ($) 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 | $ |  |  |  | $ 18,000 |  |  |  |  |  |  |
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 | $ |  |  |  | $ 2,400 |  | $ 2,400 |  |  |  |  |
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 | $ |  | $ 9,717 |  | $ 9,717 |  |  |  | $ 27,700 |  |  |
Convertible preferred stock, converted into common stock | shares |  |  |  | 21,619 | 21,619 |  |  |  |  |  |
Conversion of stock conversion price | $ / shares |  | $ 1.84 |  | $ 1.84 |  |  |  |  |  |  |
Preferred stock deemed dividends | $ |  | $ 939 | $ 0 | $ 8,601 |  | $ 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 “Series C 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, a “Series C Installment Amount” and the date of each such payment, a “Series C Installment Date”). The holders will have the ability to defer installment payments, but not beyond the Series C Maturity Date. In addition, during each period commencing on the 11th trading day prior to a Series C Installment Date and prior to the immediately subsequent Series C 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 Series C Installment Amounts, or (b) the number of Series C Preferred Shares subject to prior accelerations exceeds in the aggregate twelve Series C 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 “Series C 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, a “Series C Installment Amount” and the date of each such payment, a “Series C Installment Date”). The holders will have the ability to defer installment payments, but not beyond the Series C Maturity Date. In addition, during each period commencing on the 11th trading day prior to a Series C Installment Date and prior to the immediately subsequent Series C 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 Series C Installment Amounts, or (b) the number of Series C Preferred Shares subject to prior accelerations exceeds in the aggregate twelve Series C 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 Series C 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 Series C 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 |  | 11,681 |  | 11,681 |  |  |  | 33,300 |  | 11,681 | 33,300
Preferred stock, shares outstanding | shares |  | 11,681 |  | 11,681 |  |  |  | 33,300 |  | 11,681 | 33,300
Temporary equity, carrying amount, attributable to parent | $ |  | $ 9,700 |  | $ 9,700 |  |  |  | $ 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 the Series C Preferred Stock (the “Series C Certificate of Designations”), at an initial conversion price equal to $1.84 per share of common stock. The initial conversion price was reduced to $1.50 per share effective August 27, 2018 in connection with the offering of the Company’s Series D Preferred Stock (as defined and further described in Note 19. “Subsequent Events”). The conversion price is subject to further adjustment as provided in the Series C Certificate of Designations, including adjustments if we sell shares of common stock or equity securities convertible into or exercisable for shares of common stock, at variable prices below the conversion price then in effect. In the event of a triggering event, as defined in the Series C Certificate of Designations, the Series C Preferred Shares are convertible into shares of common stock at a conversion price of the lower of the conversion price then in effect 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 the Series C Preferred Stock (the “Series C Certificate of Designations”), at an initial conversion price equal to $1.84 per share of common stock. The initial conversion price was reduced to $1.50 per share effective August 27, 2018 in connection with the offering of the Company’s Series D Preferred Stock (as defined and further described in Note 19. “Subsequent Events”). The conversion price is subject to further adjustment as provided in the Series C Certificate of Designations, including adjustments if we sell shares of common stock or equity securities convertible into or exercisable for shares of common stock, at variable prices below the conversion price then in effect. In the event of a triggering event, as defined in the Series C Certificate of Designations, the Series C Preferred Shares are convertible into shares of common stock at a conversion price of the lower of the conversion price then in effect 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] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Conversion of stock conversion price | $ / shares |  |  |  |  |  |  |  |  | $ 1.50 |  |
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 | $ |  |  |  |  | $ 0.9 |  | $ 0.9 |  |  |  |
Interest expense, other | $ |  |  |  |  | $ 2.1 |  | $ 1.9 |  |  |  |
Carrying value of preferred shares, total |  | $ 15,700 |  | $ 15,700 |  |  |  | $ 15,100 |  | $ 20.5 | $ 19.4

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- Definition The redemption terms of preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity. The redemption features of this capital stock are solely within the control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21564-112644 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of voting rights of nonredeemable preferred stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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