Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Detail)

v3.19.3.a.u2
Employee Benefit Plans (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Retirement Benefits [Abstract]    
Defined contribution costs $ 2.9 $ 2.3