Annual report pursuant to Section 13 and 15(d)

Employee Benefits Plans - Profit Sharing and 401K (Details)

v3.8.0.1
Employee Benefits Plans - Profit Sharing and 401K (Details) - USD ($)
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Retirement Benefits [Abstract]      
Matching contribution (as a percent) (up to) 4.00%    
Contribution to plan $ 445,000 $ 401,000 $ 360,000
Contribution to profit sharing plan $ 378,000 $ 291,000 $ 165,000