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Intangible assets (Parenthetical) (Detail)	6 Months Ended
	Apr. 30, 2017
Non-compete agreements (estimated lives 3 - 5 years) | Maximum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Non-compete agreements (estimated lives 3 - 5 years) | Minimum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Customer relationships (estimated lives 7 - 15 years) | Maximum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Customer relationships (estimated lives 7 - 15 years) | Minimum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Patents (estimated life 14 years)
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	14 years

X

- Definition

Intangible Assets [Line Items]

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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