Annual report pursuant to Section 13 and 15(d)

Settlement Agreement (Detail)

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Settlement Agreement (Detail)
$ in Thousands
12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Apr. 19, 2018
USD ($)
installment
Loss Contingencies [Line Items]      
Settlement income $ 0 $ 14,803  
Other current assets 13,144 14,137  
Settlement Agreement      
Loss Contingencies [Line Items]      
Aggregate net payments to be received     $ 15,700
Number of equal installments payable | installment     4
Settlement income   $ 14,800  
Installment payments received 7,900    
Other current assets $ 7,800