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Post Retirement Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 21, 2016 | Jan. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Company's pension contributions |  |  | $ 17.3 | $ 8.2 |
Company's pension contributions paid directly by the Company |  |  | 3.3 |  |
Company's estimated pension contributions |  |  | $ 20.6 |  |
Expected return on plan assets |  |  | 5.51% |  |
Settlement cost |  |  | $ (0.1) | (0.1) |
Aggregated accumulated benefit obligation |  |  | 752.9 | 739.9 |
Fair value of plan assets |  |  | $ 626.3 | $ 624.7 | $ 650.8
Class A Common Stock |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Common stock shares authorized (shares) |  |  | 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 |
Scenario, Forecast |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Decrease in projected benefits obligation from settlements |  | $ 81.6 |  |  |
Settlement cost |  | $ 22.8 |  |  |
Subsequent Event |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Annuity contract purchased | $ 49.2 |  |  |  |
Lump sum payments | $ 32.4 |  |  |  |
401 (k) Savings Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Company contributions to 401(k) plans |  |  | $ 7.2 | $ 7.8 | 7.3
Pension Plans, Defined Benefit |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Company's pension contributions |  |  | 20.6 | $ 11.4 | $ 16.9
Amortization loss of prior service costs |  |  | $ 15.0 |  |
Pension Plans, Defined Benefit | Class A Common Stock |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Common stock shares authorized (shares) |  |  | 247,504 | 247,504 |
Pension Plans, Defined Benefit | Class B Common Stock |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Common stock shares authorized (shares) |  |  | 160,710 | 160,710 |
Postretirement Health Care and Life Insurance Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Aggregated accumulated benefit obligation |  |  | $ 13.6 | $ 14.9 |
Fair value of plan assets |  |  | $ 0.0 | $ 0.0 |

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- Definition Defined Benefit Plan Contributions By Employer Optional Cash Contributions + References No definition available. + Details
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- Definition Defined Benefit Plan, Non-participating Annuity Contract, Settlements,Benefit Obligation + References No definition available. + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + 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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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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