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Goodwill and Intangible Assets - Additional Information (Details) - USD ($)		6 Months Ended	12 Months Ended
	Jul. 31, 2019	Oct. 31, 2019	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Goodwill And Intangible Assets [Line Items]
Goodwill		$ 4,075,000	$ 4,075,000	$ 4,075,000
Intangible assets		21,264,000	21,264,000	9,592,000
Goodwill and intangible assets, impairment	$ 0		0	0	$ 0
Versa Acquisition [Member]
Goodwill And Intangible Assets [Line Items]
Intangible assets		21,300,000	21,300,000	$ 9,600,000
Bridgeport Fuel Cell, LLC [Member]
Goodwill And Intangible Assets [Line Items]
Intangible assets		11,700,000	11,700,000
Intangible assets recorded during the period			$ 12,300,000
Amortization expenses		$ 600,000

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- Definition

Goodwill and intangible assets.

+ References

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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- Definition

Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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