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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)