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Post Retirement Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Company's pension contributions |  |  | $ 85.5 |  |
Expected return on plan assets |  |  | 4.53% |  |
Annuity contract purchased |  |  |  | $ 49.2 |
Lump sum payments |  |  |  | 45.2 |
Pension settlement charge |  |  |  | 94.4 |
Pension settlement charge | $ 0.9 | $ 1.5 |  | 25.9 |
Amortization loss of prior service costs | 0.2 |  | $ 0.2 |  |
Fair value of plan assets | $ 594.8 | $ 568.6 | $ 594.8 | $ 568.6 | $ 626.3
Class A Common Stock |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Common stock shares authorized (shares) | 128,000,000 | 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 | 69,120,000 |
Pension Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Company's pension contributions |  |  | $ 81.7 | $ 14.4 | 20.6
Company's pension contributions paid directly by the Company |  |  | 3.8 |  |
Company's estimated pension contributions | $ 14.3 |  | 14.3 |  |
Pension settlement charge |  |  |  | 101.7 |
Pension settlement charge |  |  | 1.3 | 27.8 | 0.1
Aggregated accumulated benefit obligation | 638.9 | $ 686.8 | 638.9 | 686.8 |
Fair value of plan assets | $ 594.8 | $ 568.6 | $ 594.8 | $ 568.6 |
Pension Plan | Class A Common Stock |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Common stock shares authorized (shares) | 247,504 | 247,507 | 247,504 | 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 | 160,710 |
Other Postretirement Benefits Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Company's pension contributions paid directly by the Company |  |  | $ 1.0 | $ 0.8 | 1.1
Company's estimated pension contributions | $ 1.3 |  | 1.3 |  |
Aggregated accumulated benefit obligation | 10.7 | $ 12.6 | 10.7 | 12.6 |
Fair value of plan assets | 0.0 | 0.0 | 0.0 | 0.0 |
Foreign Plan | United Kingdom |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 178.7 | 188.9 | 178.7 | 188.9 | 185.1
Foreign Plan | United Kingdom | Pension Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Lump sum payments |  |  | 4.7 | 7.3 |
Pension settlement charge |  |  |  | 7.3 |
Pension settlement charge |  |  | 1.3 | 1.2 | 0.0
Aggregated accumulated benefit obligation | 176.3 | 186.9 | 176.3 | 186.9 |
Fair value of plan assets | 178.7 | 188.9 | 178.7 | 188.9 |
Foreign Plan | Germany |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | 0.0 | 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 |  |  | 0.0 | 0.7 | 0.0
Projected benefit obligation transferred to third party |  |  |  | 1.8 |
Aggregated accumulated benefit obligation | 37.2 | 38.1 | 37.2 | 38.1 |
Fair value of plan assets | $ 0.0 | $ 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 |  |  | $ 9.4 | $ 8.3 | $ 7.2

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