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Post Retirement Benefit Plans - Weighted Average Asset Allocations at Measurement Date and Target Asset Allocations (Detail) | Oct. 31, 2018 | Oct. 31, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |
Total, Target | 100.00% | 100.00%
Total, Actual | 100.00% | 100.00%
Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total, Target | 15.00% | 22.00%
Total, Actual | 21.00% | 24.00%
Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total, Target | 63.00% | 49.00%
Total, Actual | 50.00% | 44.00%
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total, Target | 22.00% | 29.00%
Total, Actual | 29.00% | 32.00%

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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