XML 28 R12.htm IDEA: XBRL DOCUMENT v3.10.0.1
Accounts Receivable
 12 Months Ended
Sep. 30, 2018
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable, net consisted of the following (in thousands):
 
September 30, 2018
 
September 30, 2017
Trade accounts receivable
$
368,467

 
$
417,516

Unbilled accounts receivable under long-term contracts
33,413

 
27,515

Gross accounts receivable
401,880

 
445,031

Less: allowance for doubtful accounts
(11,724
)
 
(14,333
)
Less: allowance for sales returns
(11,324
)
 
(35,306
)
Accounts receivable, net
$
378,832

 
$
395,392