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Income tax provision - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	Oct. 31, 2015
Income Taxes [Line Items]
Provision for income tax as percentage of income (loss) before income taxes	6.00%	(211.00%)	(25.00%)	11.00%
Unrecognized tax benefits	$ 0		$ 0		$ 0
Accrued interest and penalties related to uncertain tax positions	$ 0		0		$ 0
Income Tax Expense (Benefit) Windfalls From Exercise And Disposition Of Equity Based Incentive Awards			159,000
Common Stock Including Additional Paid in Capital [Member]
Income Taxes [Line Items]
Income Tax Expense (Benefit) Windfalls From Exercise And Disposition Of Equity Based Incentive Awards			$ 159,000

X

- Definition

The amount of income tax expense benefit due to windfalls from the exercise and disposition of equity-based incentive awards.

+ References

No definition available.

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- Definition

Income Taxes [Line Items]

+ References

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X

- Definition

Total Provision as Percentage Of Pre-Tax Income.

+ References

No definition available.

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X

- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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X

- Definition

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319

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