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Commitments and Contingencies - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Apr. 30, 2019	Oct. 31, 2018
Loss Contingencies [Line Items]
Contingent liability under purchase agreements for future chassis inventory purchases	$ 55,000,000	$ 54,500,000
Repurchase agreement	2 years
Represents the gross value of all vehicles under repurchase agreements	$ 258,800,000	310,500,000
Maximum [Member]
Loss Contingencies [Line Items]
Estimated loss exposure under contract	$ 26,100,000	$ 25,200,000

X

- Definition

Repurchase agreement term maximum.

+ References

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- Definition

Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12021-110248

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