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Significant Accounting Policies - Goodwill, Income Taxes, and Cash and Cash Equivalents (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Amortization of acquired intangible assets |  |  | $ 1,321,000 |  |  |
Goodwill and other intangible assets, net | $ 25,989,000 |  | 25,989,000 |  |  | $ 35,000,000
Cash, FDIC Insured Amount |  |  |  |  | $ 250,000 |
Direct expenses | 22,871,000 | $ 19,533,000 | 66,805,000 | $ 46,885,000 |  |
General and administrative expenses | 4,122,000 | $ 3,374,000 | 12,722,000 | $ 8,402,000 |  |
Danya |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Amortization of acquired intangible assets | $ 400,000 |  | $ 1,000,000 |  |  |
Property, Plant and Equipment, Useful Life |  |  | 10 years |  |  |
Reclassification Adjustment |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Direct expenses |  |  | $ 100,000 |  |  |
General and administrative expenses |  |  | $ (100,000) |  |  |

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