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Other current assets - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Increase (Decrease) In Other Noncurrent Assets	$ (35)	$ 136
Notes Receivable [Member]
Increase (Decrease) In Other Noncurrent Assets	$ 63

X

- Definition

Amount of increase (decrease) in noncurrent assets classified as other.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_NotesReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: