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Concentrations of credit risk (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Concentration Risk [Line Items]
Cash, FDIC insured amount	$ 11.8		$ 11.8
Sales Revenue, Goods, Net | Distributor A [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		59.00%	23.00%	65.00%
Sales Revenue, Goods, Net | Distributor B [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%
Sales Revenue, Goods, Net | Equipment Manufacturer [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	35.00%		19.00%
Accounts Receivable | Distributor A [Member]
Concentration Risk [Line Items]
Concentration risk, percentage				61.00%
Accounts Receivable | Distributor B [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			11.00%
Accounts Receivable | Equipment Manufacturer [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			47.00%

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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.

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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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