Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Operating Leases) (Details)

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Commitments and Contingencies (Operating Leases) (Details) - USD ($)
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]      
Operating leases, rental expense $ 1,400,000 $ 1,200,000 $ 1,000,000
Operating leases, term of contract 1 year    
Future minimum rental commitments $ 2,600,000    
Future minimum rental commitments, due in fiscal 2017 1,200,000    
Future minimum rental commitments, due in fiscal 2018 700,000    
Future minimum rental commitments, due in fiscal 2019 400,000    
Future minimum rental commitments, due in fiscal 2020 200,000    
Future minimum rental commitments, due in fiscal 2021 100,000    
Future minimum rental commitments, due thereafter $ 0