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Significant Accounting Policies (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2017
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | $ 25,989,000 |  | $ 25,989,000 |  | $ 25,989,000
Goodwill impairment |  |  |  |  | 0
Uncertain tax positions | 0 |  | 0 |  | $ 0
Income tax interest expense | 0 | $ 0 |  |  |
Income tax penalties expense |  |  | 0 | $ 0 |
Cash, FDIC insured amount | $ 250,000,000 |  | $ 250,000,000 |  |
Employee Stock Option |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Number of awards authorized for issuance (in shares) | 0 |  | 0 |  |
Expiration term of share-based compensation plan |  |  | 10 years |  |
Employee Stock Option | Long Term Incentive Plan 2006 [Member] |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Number of awards authorized for issuance (in shares) | 0 |  | 0 |  |
Expiration term of share-based compensation plan |  |  | 10 years |  |
Minimum |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Estimated useful of long-lived assets |  |  | 3 years |  |
Maximum |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Estimated useful of long-lived assets |  |  | 7 years |  |

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