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Credit Facilities - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($)
Line of Credit Facility [Line Items] |  |  |
Debt amortization fiscal year 2021 | $ 0 | $ 0 |
Debt amortization fiscal year 2022 | 6,750,000 | 6,750,000 |
Debt amortization fiscal 2023 | 8,750,000 | 8,750,000 |
Debt amortization fiscal 2024 | 8,750,000 | 8,750,000 |
Debt amortization fiscal 2025 | 38,500,000 | 38,500,000 |
Voluntary principal amortization of term debt | 3,800,000 |  |
Interest Rate Swap |  |  |
Line of Credit Facility [Line Items] |  |  |
Derivative notional amount | $ 28,800,000 | $ 28,800,000 | $ 36,000,000
Derivative fixed interest rate | 1.61% | 1.61% |
Interest expense increase (less than) |  | $ 200,000 |
Secured Debt | Term Loans |  |  |
Line of Credit Facility [Line Items] |  |  |
Fixed charge coverage ratio |  | 1.25 |
Ratio of funded indebtedness to EBITDA through maturity |  | 2.75 |
Debt amortization fiscal year 2021 | $ 7,000,000.0 | $ 7,000,000.0 |
Debt amortization fiscal year 2022 | 7,000,000.0 | 7,000,000.0 |
Debt amortization fiscal 2023 | 8,750,000 | 8,750,000 |
Debt amortization fiscal 2024 | 8,750,000 | 8,750,000 |
Debt amortization fiscal 2025 | $ 8,750,000 | $ 8,750,000 |
Secured Debt | 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 |
Secured Debt | Term Loans | Excess Cash Flows Less Than 2.50 |  |  |
Line of Credit Facility [Line Items] |  |  |
Percentage of excess cash flow for each year of funded indebtedness to EBDTA |  | 50.00% |
Secured Debt | 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 |
Secured Debt | 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 |
Secured Debt | Term Loans | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Ratio of funded indebtedness to EBITDA through maturity |  | 3.75 |
Interest rate spread | 4.50% | 4.50% |
Secured Debt | Term Loans | Maximum | Excess Cash Flows Less Than 2.50 |  |  |
Line of Credit Facility [Line Items] |  |  |
Ratio of funded indebtedness to adjusted EBDTA, actual |  | 2.50 |
Secured Debt | Term Loans | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest rate spread | 2.50% | 2.50% |
Secured Debt | Term Loans | LIBOR |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest rate spread | 0.12% | 0.12% |
Secured Debt | Revolving Line of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit, maximum borrowing capacity | $ 25,000,000.0 | $ 25,000,000.0 |
Line of credit outstanding balance | 0 | 0 |
Line of credit, current borrowing capacity | $ 25,000,000.0 | $ 25,000,000.0 |
Secured Debt | Revolving Line of Credit | LIBOR |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest rate spread | 0.12% | 0.12% |
Secured Debt | Letter of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit, current borrowing capacity | $ 5,000,000 | $ 5,000,000 |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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