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Post Retirement Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2017 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company's pension contributions |  | $ 14.4 |  |
Expected return on plan assets |  | 5.51% |  |
Annuity contract purchased |  | $ 49.2 |  |
Lump sum payments |  | 45.2 |  |
Pension settlement charge |  | 94.4 |  |
Pension settlement charge | $ 1.5 | 25.9 |  |
Amortization loss of prior service costs | 0.2 | 0.2 |  |
Fair value of plan assets | $ 568.6 | $ 568.6 | $ 626.3 | $ 624.7
Class A Common Stock |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Common stock shares authorized (shares) | 128,000,000 | 128,000,000 | 128,000,000 |
Class B Common Stock |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Common stock shares authorized (shares) | 69,120,000 | 69,120,000 | 69,120,000 |
Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company's pension contributions |  | $ 11.1 | $ 20.6 | 11.4
Company's pension contributions paid directly by the Company |  | 3.3 |  |
Company's estimated pension contributions | $ 20.6 | 20.6 |  |
Pension settlement charge |  | 101.7 |  |
Pension settlement charge |  | 27.8 | 0.1 | 0.1
Aggregated accumulated benefit obligation | 686.8 | 686.8 | 752.9 |
Fair value of plan assets | $ 568.6 | $ 568.6 | $ 626.3 |
Pension Plan | Class A Common Stock |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Common stock shares authorized (shares) | 247,507 | 247,507 | 247,507 |
Pension Plan | Class B Common Stock |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Common stock shares authorized (shares) | 160,710 | 160,710 | 160,710 |
Other Postretirement Benefits Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company's pension contributions paid directly by the Company |  | $ 0.8 | $ 1.1 | 1.5
Company's estimated pension contributions | $ 1.5 | 1.5 |  |
Aggregated accumulated benefit obligation | 12.6 | 12.6 | 13.6 |
Fair value of plan assets | 0.0 | 0.0 | 0.0 |
Foreign Plan | United Kingdom |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 188.9 | 188.9 | 185.1 | 208.4
Foreign Plan | United Kingdom | Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Lump sum payments |  | 7.3 |  |
Pension settlement charge |  | 7.3 |  |
Pension settlement charge |  | 1.2 | 0.0 | 0.0
Aggregated accumulated benefit obligation | 186.9 | 186.9 | 171.4 |
Fair value of plan assets | 188.9 | 188.9 | 185.1 |
Foreign Plan | Germany |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 0.0 | 0.0 | 0.0 | 0.0
Foreign Plan | Germany | Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension settlement charge |  | 0.0 |  |
Pension settlement charge |  | 0.7 | 0.0 | 0.0
Projected benefit obligation transferred to third party |  | 1.8 |  |
Aggregated accumulated benefit obligation | 38.1 | 38.1 | 39.1 |
Fair value of plan assets | $ 0.0 | 0.0 | 0.0 |
Defined benefit plan, net periodic benefit cost (credit), gain (loss) due to sale of business |  | 0.7 |  |
401 (k) Savings Plan |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Company contributions to 401(k) plans |  | $ 8.3 | $ 7.2 | $ 7.8

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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