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Loan Receivable - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2012
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Receivables [Abstract]          
Carrying value of the loan receivable     $ 200 $ 1,000  
Variable Interest Entity [Line Items]          
Loan provided to borrower     250 $ 5,500 $ 0
Impairment charge     $ 800    
Variable Interest Entity          
Variable Interest Entity [Line Items]          
Loan provided to borrower   $ 3,000      
Loans Receivable, Interest Rate   9.00% 10.00%    
Term extension 5 years        
Variable Interest Entity | Selling, General and Administrative Expenses          
Variable Interest Entity [Line Items]          
Impairment charge $ 2,600