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Contract Balances and Performance Obligations (Tables)
 12 Months Ended
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]  
Receivables
Receivables at September 30, 2020 and 2019 consisted of the following: 
 
September 30,
 
2020
 
2019
 
(In thousands)
Billed
$
211,776

 
$
206,714

Unbilled
181,550

 
127,651

 
393,326

 
334,365

Less: allowance for doubtful accounts
(5,072
)
 
(2,568
)
Net receivables
388,254

 
331,797

    Less: long-term receivables *
(54,074
)
 
(34,370
)
    Short-term receivables *
334,180

 
297,427

 
(*) Short-term receivables and long-term receivables were recorded in accounts receivable, net and other assets, respectively, within the accompanying consolidated balance sheets.
Accounts Receivable, Allowance for Credit Loss
Activity in the allowance for doubtful accounts was as follows: 
 
Year Ended September 30,
 
2020
 
2019
 
(In thousands)
Allowance for doubtful accounts, beginning balance
$
2,568

 
$
3,439

Add: expense
3,199

 
518

Less: write-offs (net of recoveries)
(695
)
 
(1,389
)
Allowance for doubtful accounts, ending balance
$
5,072

 
$
2,568
Contract with Customer, Asset and Liability Significant changes in the deferred revenues balances are as follows:
 
Year Ended September 30,
 
2020
 
2019
 
(In thousands)
Deferred revenues, beginning balance
$
116,320

 
$
108,118

Revenue recognized that was included in the deferred revenues balance at the beginning of the period
(101,640
)
 
(93,265
)
Increases due to billings, excluding amounts recognized as revenue during the period
107,461

 
101,467

Deferred revenues, ending balance (*)
$
122,141

 
$
116,320


 
(*) Ending balance at September 30, 2020 included current portion of $115.1 million and long-term portion of $7.0 million that were recorded in deferred revenue and other liabilities, respectively, within the consolidated balance sheets. Ending balance at September 30, 2019 included current portion of $111.0 million and long-term portion of $5.3 million that were recorded in deferred revenue and other liabilities, respectively, within the consolidated balance sheets.