Insurance - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	9 Months Ended
	Jul. 31, 2019	Apr. 30, 2019	Jul. 31, 2019	Jul. 31, 2018
Schedule of Other Liabilities [Line Items]
Self insurance retention amount per-claim	$ 1.0		$ 1.0
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	(3.0)
Change in reserves for insurance claims		$ 5.0	2.0	$ 10.0
Insurance reserve adjustment, amount lower than prior year adjustment			(8.0)
Minimum
Schedule of Other Liabilities [Line Items]
Primary policy limit	1.0		1.0
Maximum
Schedule of Other Liabilities [Line Items]
Primary policy limit	5.0		5.0
Self insurance retention amount per-claim, medical plan	$ 0.5		$ 0.5