Annual report pursuant to Section 13 and 15(d)

Settlement Agreement (Detail)

v3.20.2
Settlement Agreement (Detail) - Settlement Agreement
$ in Millions
12 Months Ended
Sep. 30, 2018
USD ($)
Apr. 19, 2018
USD ($)
installment
Loss Contingencies [Line Items]    
Aggregate net payments to be received   $ 15.7
Number of equal installments payable | installment   4
Gain related to litigation settlement $ 14.8