XML 64 R46.htm IDEA: XBRL DOCUMENT v3.10.0.1
Property and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Property Plant And Equipment [Abstract]      
Depreciation and amortization $ 10,673 $ 9,364 $ 7,964