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Post Retirement Benefit Plans - Weighted Average Asset Allocations at Measurement Date and Target Asset Allocations (Detail) | 12 Months Ended
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Oct. 31, 2016 | Oct. 31, 2015
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Total, Target | 100.00% | 100.00%
Total, Actual | 100.00% | 100.00%
Equity securities |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Total, Target | 25.00% | 23.00%
Total, Actual | 29.00% | 28.00%
Debt securities |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Total, Target | 49.00% | 51.00%
Total, Actual | 40.00% | 40.00%
Other |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |
Total, Target | 26.00% | 26.00%
Total, Actual | 31.00% | 32.00%

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- Definition Pension plans, postretirement and other employee benefits. + References No definition available. + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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