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
|
|