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Post Retirement Benefit Plans - Schedule of Other Comprehensive Income Included in Financial Statement (Detail) - USD ($) $ in Millions | Oct. 31, 2016 | Oct. 31, 2015
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Compensation and Retirement Disclosure [Abstract] |  |
Unrecognized net actuarial gain | $ (2.2) | $ 1.6
Unrecognized prior service credit | (4.3) | 5.8
Accumulated other comprehensive income | $ (6.5) | $ 7.4

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- References No definition available. + Details
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- Definition After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise. + References No definition available. + Details
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- Definition Amount after tax of cost (credit) due to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as a component of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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- Definition After tax amount of transition assets (obligations), as of the date FAS 87 or 106 was initially applied, that has not yet been recognized as a component of net periodic benefit cost. + References No definition available. + Details
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