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Intangible assets (parenthetical) (Detail)	3 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Non-compete agreements (estimated lives 3 - 5 years) | Maximum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Non-compete agreements (estimated lives 3 - 5 years) | Minimum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years	3 years
Customer relationships (estimated lives 7 - 15 years) | Maximum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years	15 years
Customer relationships (estimated lives 7 - 15 years) | Minimum [Member]
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years	7 years
Backlog (estimated life 1 year)
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year	1 year
Patents (estimated life 14 years)
Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	14 years	14 years

X

- Definition

Intangible Assets [Line Items]

+ References

No definition available.

+ Details

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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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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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