Income Taxes - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Oct. 31, 2019 USD ($)	Oct. 31, 2020 USD ($) state	Oct. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)
Income Taxes [Line Items]
U.S. statutory rate		21.00%	21.00%	23.30%
Net discrete tax benefit from remeasurement of deferred taxes at new rate due to Tax Act				$ 29.6
Remeasurement of one-time transition tax on deemed repatriation of indefinitely reinvested earnings			$ 2.7	$ (4.5)
Tax benefit related to lapse of statute of limitations	$ (1.8)		$ (1.3)
Effective tax rate (percent)		99.60%	20.40%	(9.40%)
Income tax provision		$ (53.1)	$ (32.7)	$ 8.2
Nondeductible impairment loss		$ 163.8
Effective tax rate , excluding nondeductible impairment loss (percent)		24.40%
State true-ups		$ 5.7	1.7
Work opportunity tax credit, adjustment		2.3	1.3
Income tax benefit related to deduction for energy efficiency		2.1
Income tax benefit related to change in tax reserves		1.1
Federal true-ups			(1.6)
Income tax benefit related to vesting of share-based compensation awards			(1.1)
Benefit resulting from research and development credits			(0.9)
Tax credits		4.4
Unrecognized tax benefits that would impact effective tax rate	35.3	35.5	35.3	35.8
Maximum decrease in unrecognized tax benefits that is reasonably possible		0.6
Uncertain tax positions, interest and penalties accrued	$ 1.2	1.5	1.2
Unrecognized tax benefits, interest and penalties expense		$ 0.4	$ 0.2
Unrecognized tax benefits, interest and penalties benefit				$ (1.0)
Number of states in which entity operates | state		50
State and Local Jurisdiction
Income Taxes [Line Items]
Operating loss carryforwards		$ 102.3