Credit Facilities - Narrative (Details) - Secured Debt	1 Months Ended	9 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Term Loans
Line of Credit Facility [Line Items]
Secured term loan, face amount	$ 70,000,000	$ 70,000,000
Fixed charge coverage ratio		1.25
Ratio of funded indebtedness to EBITDA through maturity		3.25
Voluntary repayments of lines of credit	$ 3,900,000
Number of quarterly principal installments voluntarily paid	3
Term Loans | Excess Cash Flows Greater Than Or Equal to 2.50
Line of Credit Facility [Line Items]
Percentage of excess cash flow for each year of funded indebtedness to EBDTA		75.00%
Ratio of funded indebtedness to adjusted EBDTA, actual		2.50
Term Loans | Excess Cash Flows Less Than 2.50 But Greater Than 1.50 [Member]
Line of Credit Facility [Line Items]
Percentage of excess cash flow for each year of funded indebtedness to EBDTA		50.00%
Term Loans | Excess Cash Flows Equal to 1.50
Line of Credit Facility [Line Items]
Ratio of funded indebtedness to adjusted EBDTA, actual		1.5
Term Loans | Excess Cash Flows Less Than 1.50
Line of Credit Facility [Line Items]
Percentage of excess cash flow for each year of funded indebtedness to EBDTA		0.00%
Ratio of funded indebtedness to adjusted EBDTA, actual		1.5
Term Loans | Maximum
Line of Credit Facility [Line Items]
Ratio of funded indebtedness to EBITDA through maturity		4.25
Term Loans | Maximum | Excess Cash Flows Less Than 2.50 But Greater Than 1.50 [Member]
Line of Credit Facility [Line Items]
Ratio of funded indebtedness to adjusted EBDTA, actual		2.50
Term Loans | LIBOR
Line of Credit Facility [Line Items]
Interest rate spread	2.42%	2.42%
Term Loans | LIBOR | Maximum
Line of Credit Facility [Line Items]
Interest rate spread	4.50%	4.50%
Term Loans | LIBOR | Minimum
Line of Credit Facility [Line Items]
Interest rate spread	2.50%	2.50%
Revolving Line of Credit
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	$ 25,000,000	$ 25,000,000
Line of credit, current borrowing capacity	19,600,000	19,600,000
Line of credit, unused borrowing capacity	19,600,000	19,600,000
Letter of Credit
Line of Credit Facility [Line Items]
Line of credit, current borrowing capacity	3,000,000	3,000,000
Line of credit, unused borrowing capacity	$ 0	$ 0