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Debt (Narrative) (Details) $ in Thousands |  | 9 Months Ended | 30 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 14, 2017 USD ($) | Sep. 30, 2017 USD ($) item | Jun. 30, 2019 | Jun. 29, 2016 USD ($) | Jun. 28, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Credit facility borrowing base |  |  |  |  | $ 20,000
Debt service coverage ratio minimum at each quarter |  | 1.2 |  |  |
Loans payable, net of issuance costs |  | $ 11,000 |  |  |
Commitment fee percentage |  | 2.30% |  |  |
Maximum [Member] | Scenario, Forecast [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Ratio of net debt to EBITDAX |  |  | 3.0 |  |
Senior Tranche [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, commitment fee |  | 1.50% |  |  |
Line Of Credit Facility Maximum Borrowing Capacity |  |  |  |  | $ 50,000
Subordinated Tranche [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, commitment fee |  |  |  |  | 2.30%
Line Of Credit Facility Maximum Borrowing Capacity |  |  |  |  | $ 15,000
Additional Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, additional borrowing available |  |  |  | $ 5,000 |
Borrowings | $ 4,200 |  |  |  |
Number of quarterly principal installments | item |  | 5 |  |  |
Commitment fees, amount | $ 0 |  |  |  |
Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument maximum borrowing capacity |  |  |  | $ 15,000 |
Debt instrument interest rate spread |  | 5.75% |  |  |
Loans Payable |  | $ 11,200 |  |  |

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- Definition Amount of commitment fees for the unused borrowing capacity under the long-term financing arrangement that is available to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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