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Valuation and Qualifying Accounts
 12 Months Ended
Sep. 30, 2016
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
(Thousands of dollars)
 
Balance at
beginning of
year
 
Charged to
costs and
expenses
 
Other
 
Balance at
end of
year
 
September 30, 2016
 
 
 
 
 
  
 
 
Reserves deducted from assets in the consolidated balance sheet:
 
 
 
 
 
  
 
 
Allowance for doubtful accounts
$
5,599

 
$
7,760

 
$
(9,413
)
(1) 
$
3,946

 
 
 
 
 
 
 
 
 
 
September 30, 2015
 
 
 
 
 
  
 
 
Reserves deducted from assets in the consolidated balance sheet:
 
 
 
 
 
  
 
 
Allowance for doubtful accounts
$
6,992

 
$
13,498

 
$
(14,891
)
(1) 
$
5,599

 
 
 
 
 
 
 
 
 
 
September 30, 2014
 
 
 
 
 
  
 
 
Reserves deducted from assets in the consolidated balance sheet:
 
 
 
 
 
  
 
 
Allowance for doubtful accounts
$
5,519

 
$
13,149

 
$
(11,676
)
(1) 
$
6,992

 
(1)
Uncollectible accounts written off, net of recoveries