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