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Derivative Instruments and Hedging Activities (Tables)
 3 Months Ended
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Components of Fair Value of Derivative Assets and Liabilities
The following table presents our derivative assets and liabilities by type, as well as the effects of offsetting, as of December 31, 2017, September 30, 2017 and December 31, 2016:

 
 
December 31,
2017
 
September 30,
2017
 
December 31,
2016
Derivative assets not designated as hedging instruments:
 
 
 
 
 
 
Commodity contracts
 
$
41,187

 
$
40,714

 
$
34,625

Total derivative assets — gross
 
41,187

 
40,714

 
34,625

Gross amounts offset in the balance sheet
 
(633
)
 
(920
)
 
(151
)
Cash collateral received
 
(8,176
)
 
(7,991
)
 
—

Total derivative assets — net
 
$
32,378

 
$
31,803

 
$
34,474

 
 
 
 
 
 
 
Derivative liabilities not designated as hedging instruments:
 
 
 
 
 
 
Commodity contracts
 
$
(633
)
 
$
(920
)
 
$
(151
)
Total derivative liabilities — gross
 
(633
)
 
(920
)
 
(151
)
Gross amounts offset in the balance sheet
 
633

 
920

 
151

Total derivative liabilities — net
 
$
—

 
$
—

 
$
—
Components of Derivative Instruments Gain (Loss) In Statement of Operations
The following tables provide information on the effects of derivative instruments on the condensed consolidated statements of operations for the three months ended December 31, 2017 and 2016:
 
 
Gain
Recognized in Income
 
Location of Gain
Recognized in Income
Three Months Ended December 31,
 
2017
 
2016
 
Derivatives Not Designated as Hedging Instruments:
 
 
 
 
 
 
Commodity contracts
 
$
19,614

 
$
32,100

 
Cost of sales — propane