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Accounts Receivable
 12 Months Ended
Sep. 30, 2019
Receivables [Abstract]  
Accounts Receivable Accounts Receivable, Net
Accounts receivable, net consisted of the following (dollars in thousands):
 
September 30, 2019
 
September 30, 2018
 
(ASC 606)
 
(ASC 605)
Trade accounts receivable
$
324,643

 
$
330,515

Unbilled accounts receivable under long-term contracts
—

 
33,326

Gross accounts receivable
324,643

 
363,841

Less: allowance for doubtful accounts
(10,662
)
 
(9,823
)
Less: allowance for sales returns
(5,380
)
 
(6,145
)
Accounts receivable, net
$
308,601

 
$
347,873