Summary of Assumed Health Care Cost Trend Rates Relating to OneSource PRM Plan (Detail) (Postretirement Benefit Plans, OneSource Services Inc)	12 Months Ended
Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2011
Postretirement Benefit Plans \| OneSource Services Inc
Health Care Cost Trend Rates Assumptions [Line Items]
Health care trend rate assumed for next year	7.40%	7.60%	7.80%
Rate to which the cost trend is assumed to decline (ultimate trend rate)	4.50%	4.50%	4.50%
Year the rate reaches the ultimate trend rate	2029	2029	2029

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (l)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Health Care Cost Trend Rate

-URI http://asc.fasb.org/extlink&oid=6514820

+ Details

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- Definition

The ultimate trend rate for health care costs.

+ References

+ Details

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- Definition

Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

+ References

+ Details

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