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Valuation And Qualifying Accounts
 12 Months Ended
Sep. 30, 2017
Valuation and Qualifying Accounts [Abstract]  
Valuation And Qualifying Accounts
Schedule II — Valuation and Qualifying Accounts
 
Description
Balance at Beginning of Period
 
Additions Charged to Costs and Expenses
 
Additions Charged to Other Accounts(1)
 
Deductions (2)
 
Balance at End of Period
Year Ended September 30, 2017
 
 
 
 
 
 
 
 
 
Allowance for Uncollectible Accounts
$
21,109

 
$
6,301

 
$
1,774

 
$
6,658

 
$
22,526

Year Ended September 30, 2016
 
 
 
 
 
 
 
 
 
Allowance for Uncollectible Accounts
$
29,029

 
$
6,819

 
$
1,521

 
$
16,260

 
$
21,109

Year Ended September 30, 2015
 
 
 
 
 
 
 
 
 
Allowance for Uncollectible Accounts
$
31,811

 
$
9,316

 
$
2,585

 
$
14,683

 
$
29,029

 
(1)
Represents the discount on accounts receivable purchased in accordance with the Utility segment’s 2005 New York rate agreement.
(2)
Amounts represent net accounts receivable written-off.