Post Retirement Benefit Plans - Effect of One-Percentage Point Change In Assumed Health Care Cost Trend Rates (Detail) - Other Postretirement Benefits Plan	12 Months Ended
Oct. 31, 2017 USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
1-Percentage-Point, Effect on total of service and interest cost components	$ 18,700
1-Percentage-Point, Effect on postretirement benefit obligation	258,400
1-Percentage-Point, Effect on total of service and interest cost components	(13,500)
1-Percentage-Point, Effect on postretirement benefit obligation	$ (222,700)

Pension plans, postretirement and other employee benefits.

No definition available.

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- Definition

Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate.

+ 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 (m)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

+ Details

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- Definition

Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate.

+ References

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- Definition

Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate.

+ References

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- Definition

Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate.

+ References

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