Credit Facility (Details)			3 Months Ended	12 Months Ended
	Jul. 31, 2020 USD ($)	Oct. 31, 2018	Oct. 31, 2018 USD ($)	Jul. 31, 2020 USD ($)	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($)	Oct. 31, 2019 USD ($)
Line of Credit Facility [Line Items]
Write-off of deferred financing costs				$ 0	$ 3,217,000	$ 0
Credit Facility
Line of Credit Facility [Line Items]
Capitalized deferred financing costs							$ 1,813,000
Accordion feature	$ 250,000,000			250,000,000
Triggering event debt issuance amount	5,000,000			$ 5,000,000
Triggering event period				91 days
Credit facility amount outstanding	149,500,000			$ 149,500,000
Outstanding standby letters of credit at period end	3,067,000			3,067,000
Outstanding balance during period, minimum				125,000,000
Outstanding balance during period, maximum				174,000,000
Debt issuance costs, net	$ 2,391,000			2,391,000
Interest expense related to credit facility				$ 5,905,000	$ 8,859,000	$ 9,614,000
Weighted average interest rate	3.87%			3.87%	5.25%	5.40%
Maximum Secured Leverage Ratio	3.75	3.75
Maximum Total Leverage Ratio		4.50
Minimum Interest Expense Coverage Ratio	3.25	3.25
Actual Secured Leverage Ratio	1.99
Actual Interest Expense Coverage Ratio	14.40
Credit Facility | Federal Funds Effective Swap Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate				0.50%
Credit Facility | Adjusted LIBO Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate				1.00%
Secured Credit Facility
Line of Credit Facility [Line Items]
Write-off of deferred financing costs			$ 3,217,000
Secured Credit Facility | Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 550,000,000			$ 550,000,000
Revolving Loan Facility | Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	300,000,000			300,000,000
Letter of Credit | Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	35,000,000			35,000,000
Swingline Loan | Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 25,000,000			$ 25,000,000