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Summary of Significant Accounting Policies (ASC 606 Balance Sheet) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Accounts receivable, net |  | $ 56,417 | $ 49,819 | [1] | $ 28,855 |
Property, equipment and improvements, net |  | 13,857 | 8,354 | [1] | 13,241 |
Deferred tax assets |  | 7,330 | 6,600 | [1] | 9,278 |
Unearned revenue current |  |  | 3,177 |  | 1,812 |
Other non-current liabilities |  | 3,809 | 720 | [1] | 807 |
Retained earnings |  | $ 161,919 | 151,961 | [1] | 150,363 |
As reported |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Accounts receivable, net |  |  | 50,817 |  | 28,855 |
Property, equipment and improvements, net |  |  | 6,270 |  | 12,801 |
Deferred tax assets |  |  | 6,665 |  | 9,211 |
Unearned revenue current |  |  | 2,579 |  | 1,343 |
Other non-current liabilities |  |  | 510 |  | 654 |
Retained earnings |  |  | 151,748 |  | 150,478 |
ASU 2014-09 |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Cumulative-effect adjustment from adoption of new accounting policy |  |  |  |  |  | $ (152)
ASU 2014-09 | Impact of Adoption |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Accounts receivable, net |  |  | (998) |  | 0 |
Property, equipment and improvements, net |  |  | 2,084 |  | 440 |
Deferred tax assets |  |  | (65) |  | 67 |
Unearned revenue current |  |  | 598 |  | 469 |
Other non-current liabilities |  |  | 210 |  | 153 |
Retained earnings |  |  | $ 213 |  | $ (115) |
Retained Earnings | ASU 2014-09 |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Cumulative-effect adjustment from adoption of new accounting policy | [1] |  |  |  |  | $ (152)
[1] | Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)”, which we adopted on October 1, 2018.

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