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Concentrations of credit risk - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Concentration Risk [Line Items]
Cash, FDIC insured amount	$ 11.7		$ 11.7
Sales Revenue, Goods, Net | Distributor
Concentration Risk [Line Items]
Concentration risk, percentage	28.00%	76.00%	32.00%	68.00%
Sales Revenue, Goods, Net | Equipment Manufacturer
Concentration Risk [Line Items]
Concentration risk, percentage			10.00%
Sales Revenue, Goods, Net | Equipment Manufacturer Two
Concentration Risk [Line Items]
Concentration risk, percentage	14.00%
Accounts Receivable | Distributor
Concentration Risk [Line Items]
Concentration risk, percentage			18.00%	80.00%
Accounts Receivable | Distributor Two
Concentration Risk [Line Items]
Concentration risk, percentage	15.00%
Accounts Receivable | Equipment Manufacturer
Concentration Risk [Line Items]
Concentration risk, percentage			10.00%
Accounts Receivable | Equipment Manufacturer Two
Concentration Risk [Line Items]
Concentration risk, percentage	21.00%

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- Definition

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

+ References

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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

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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