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Post Retirement Benefit Plans - Fair Value Measurements for Pension Assets (Detail) - USD ($) $ in Millions | Oct. 31, 2015 | Oct. 31, 2014 | Oct. 31, 2013
--- | --- | --- | ---
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | $ 624.7 | $ 650.8 | $ 621.2
Mutual Funds [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 285.6 | 303.4 |
Equity Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 26.7 | 31.0 |
Cash and Cash Equivalents [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 20.0 | 13.7 |
Money Market Fund [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.6 | 0.2 |
Common Collective Trusts [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 128.3 | 132.5 |
Government Bonds [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 10.0 | 15.6 |
Corporate Bonds [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 19.7 | 3.1 |
Other Assets [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 3.6 | 0.2 |
Insurance Annuity [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 130.2 | 151.1 |
Level 1 [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 171.7 | 187.9 |
Level 1 [Member] | Mutual Funds [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 124.4 | 143.0 |
Level 1 [Member] | Equity Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 26.7 | 31.0 |
Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 20.0 | 13.7 |
Level 1 [Member] | Money Market Fund [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 0.6 | 0.2 |
Level 2 [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 322.8 | 311.8 |
Level 2 [Member] | Mutual Funds [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 161.2 | 160.4 |
Level 2 [Member] | Common Collective Trusts [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 128.3 | 132.5 |
Level 2 [Member] | Government Bonds [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 10.0 | 15.6 |
Level 2 [Member] | Corporate Bonds [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 19.7 | 3.1 |
Level 2 [Member] | Other Assets [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 3.6 | 0.2 |
Level 3 [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | 130.2 | 151.1 | $ 96.6
Level 3 [Member] | Insurance Annuity [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Fair value of plan assets | $ 130.2 | $ 151.1 |

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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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