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Post Retirement Benefit Plans - Fair Value Measurements for Pension Assets (Detail) - USD ($) $ in Millions | Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2014
--- | --- | --- | ---
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | $ 626.3 | $ 624.7 | $ 650.8
Mutual funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 257.2 | 285.6 |
Common stock |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 39.7 | 26.7 |
Cash |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 18.6 | 20.0 |
Common collective trusts |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 136.7 | 128.3 |
Corporate bonds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 29.7 | 19.7 |
Government bonds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 16.5 | 10.0 |
Insurance annuity |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 125.4 | 130.2 |
Other assets |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 2.5 | 3.6 |
Money market fund |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets |  | 0.6 |
Level 1 |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 163.2 | 171.7 |
Level 1 | Mutual funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 104.9 | 124.4 |
Level 1 | Common stock |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 39.7 | 26.7 |
Level 1 | Cash |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 18.6 | 20.0 |
Level 1 | Common collective trusts |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 1 | Corporate bonds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 1 | Government bonds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 1 | Insurance annuity |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 1 | Other assets |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 1 | Money market fund |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets |  | 0.6 |
Level 2 |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 337.7 | 322.8 |
Level 2 | Mutual funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 152.3 | 161.2 |
Level 2 | Common stock |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 2 | Cash |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 2 | Common collective trusts |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 136.7 | 128.3 |
Level 2 | Corporate bonds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 29.7 | 19.7 |
Level 2 | Government bonds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 16.5 | 10.0 |
Level 2 | Insurance annuity |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 2 | Other assets |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 2.5 | 3.6 |
Level 2 | Money market fund |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
Level 3 |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 125.4 | 130.2 | $ 151.1
Level 3 | Mutual funds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 3 | Common stock |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 3 | Cash |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 3 | Common collective trusts |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 3 | Corporate bonds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 3 | Government bonds |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Level 3 | Insurance annuity |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 125.4 | 130.2 |
Level 3 | Other assets |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | $ 0.0 | 0.0 |
Level 3 | Money market fund |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets |  | $ 0.0 |

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- Definition Pension plans, postretirement and other employee benefits. + References No definition available. + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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