Loss Per Share - Schedule of Calculation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Apr. 30, 2026 |
Apr. 30, 2025 |
Apr. 30, 2026 |
Apr. 30, 2025 |
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| Numerator | ||||
| Net loss attributable to FuelCell Energy, Inc. | $ (77,907) | $ (38,049) | $ (100,767) | $ (66,375) |
| Series B preferred stock dividends | (800) | (800) | (1,600) | (1,600) |
| Net loss attributable to common stockholders | $ (78,707) | $ (38,849) | $ (102,367) | $ (67,975) |
| Denominator | ||||
| Weighted average common shares outstanding - basic | 54,224,428 | 21,740,193 | 51,165,339 | 21,110,664 |
| Weighted average common shares outstanding - diluted | 54,224,428 | 21,740,193 | 51,165,339 | 21,110,664 |
| Net loss to common stockholders per share - basic | $ (1.45) | $ (1.79) | $ (2) | $ (3.22) |
| Net loss to common stockholders per share - diluted | $ (1.45) | $ (1.79) | $ (2) | $ (3.22) |
| Series B Preferred Stock | ||||
| Numerator | ||||
| Series B preferred stock dividends | $ (800) | $ (800) | $ (1,600) | $ (1,600) |
| X | ||||||||||
- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- References No definition available.
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| X | ||||||||||
- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Details
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