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