Insurance - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	9 Months Ended
	Jul. 31, 2020	Apr. 30, 2020	Jul. 31, 2020	Jul. 31, 2019
Schedule of Other Liabilities [Line Items]
Insurance policy coverage, general and automobile liability losses	$ 200.0		$ 200.0
Insurance policy coverage, property damage	75.0		75.0
Decrease in total reserve claims	8.5	$ 6.6	15.1
Change in reserves for insurance claims				$ 2.0
Minimum
Schedule of Other Liabilities [Line Items]
Self insurance retention amount per-claim	1.0		1.0
Primary policy limit	1.0		1.0
Maximum
Schedule of Other Liabilities [Line Items]
Self insurance retention amount per-claim	1.5		1.5
Primary policy limit	5.0		5.0
Self insurance retention amount per-claim, medical plan	$ 0.5		$ 0.5