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Acquisitions, Divestitures and Other Significant Transactions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Apr. 30, 2012
Business Combinations [Abstract]
Deferred cash payment	$ 14.3

X

- Details

Name:	us-gaap_BusinessCombinationsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Cash outflow representing an adjustment to the purchase price of a previous acquisition.

+ References

No definition available.

+ Details

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