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Fair Value Measurements (Table)
 12 Months Ended
Sep. 30, 2016
Fair Value Disclosures [Abstract]  
Fair value measurements table
The following tables summarize, by level within the fair value hierarchy, our assets and liabilities that were accounted for at fair value on a recurring basis as of September 30, 2016 and 2015. As required under authoritative accounting literature, assets and liabilities are categorized in their entirety based on the lowest level of input that is significant to the fair value measurement.
 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)(1)
 
Significant
Other
Unobservable
Inputs
(Level 3)
 
Netting and
Cash
Collateral(2)
 
September 30, 2016
 
(In thousands)
Assets:
 
 
 
 
 
 
 
 
 
Financial instruments
 
 
 
 
 
 
 
 
 
Regulated distribution segment
$
—

 
$
4,851

 
$
—

 
$
—

 
$
4,851

Nonregulated segment
—

 
39,290

 
—

 
(32,515
)
 
6,775

Total financial instruments
—

 
44,141

 
—

 
(32,515
)
 
11,626

Hedged portion of gas stored underground
52,578

 
—

 
—

 
—

 
52,578

Available-for-sale securities
 
 
 
 
 
 
 
 
 
Money market funds
—

 
2,630

 
—

 
—

 
2,630

Registered investment companies
38,677

 
—

 
—

 
—

 
38,677

Bonds
—

 
31,394

 
—

 
—

 
31,394

Total available-for-sale securities
38,677

 
34,024

 
—

 
—

 
72,701

Total assets
$
91,255

 
$
78,165

 
$
—

 
$
(32,515
)
 
$
136,905

Liabilities:
 
 
 
 
 
 
 
 
 
Financial instruments
 
 
 
 
 
 
 
 
 
Regulated distribution segment
$
—

 
$
266,489

 
$
—

 
$
(25,670
)
 
$
240,819

Nonregulated segment
—

 
57,195

 
—

 
(57,195
)
 
—

Total liabilities
$
—

 
$
323,684

 
$
—

 
$
(82,865
)
 
$
240,819

 
Quoted
Prices in
Active
Markets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)(1)
 
Significant
Other
Unobservable
Inputs
(Level 3)
 
Netting and
Cash
Collateral(3)
 
September 30, 2015
 
(In thousands)
Assets:
 
 
 
 
 
 
 
 
 
Financial instruments
 
 
 
 
 
 
 
 
 
Regulated distribution segment
$
—

 
$
746

 
$
—

 
$
—

 
$
746

Nonregulated segment
—

 
91,363

 
—

 
(82,509
)
 
8,854

Total financial instruments
—

 
92,109

 
—

 
(82,509
)
 
9,600

Hedged portion of gas stored underground
43,901

 
—

 
—

 
—

 
43,901

Available-for-sale securities
 
 
 
 
 
 
 
 
 
Money market funds
—

 
1,072

 
—

 
—

 
1,072

Registered investment companies
40,619

 
—

 
—

 
—

 
40,619

Bonds
—

 
32,509

 
—

 
—

 
32,509

Total available-for-sale securities
40,619

 
33,581

 
—

 
—

 
74,200

Total assets
$
84,520

 
$
125,690

 
$
—

 
$
(82,509
)
 
$
127,701

Liabilities:
 
 
 
 
 
 
 
 
 
Financial instruments
 
 
 
 
 
 
 
 
 
Regulated distribution segment
$
—

 
$
120,107

 
$
—

 
$
—

 
$
120,107

Nonregulated segment
—

 
125,983

 
—

 
(125,983
)
 
—

Total liabilities
$
—

 
$
246,090

 
$
—

 
$
(125,983
)
 
$
120,107


 
(1) 
Our Level 2 measurements consist of over-the-counter options and swaps, which are valued using a market-based approach in which observable market prices are adjusted for criteria specific to each instrument, such as the strike price, notional amount or basis differences, municipal and corporate bonds, which are valued based on the most recent available quoted market prices and money market funds which are valued at cost.
(2) 
This column reflects adjustments to our gross financial instrument assets and liabilities to reflect netting permitted under our master netting agreements and the relevant authoritative accounting literature. In addition, as of September 30, 2016, we had $25.7 million of cash held in margin accounts to collateralize certain regulated distribution financial instruments, which were used to offset current and noncurrent risk management liabilities. As of September 30, 2016 we also had $24.7 million of cash held in margin accounts to collateralize certain nonregulated financial instruments. Of this amount, $17.9 million was used to offset current and noncurrent risk management liabilities under master netting agreements and the remaining $6.8 million is classified as current risk management assets.
(3) 
This column reflects adjustments to our gross financial instrument assets and liabilities to reflect netting permitted under our master netting agreements and the relevant authoritative accounting literature. In addition, as of September 30, 2015 we had $43.5 million of cash held in margin accounts to collateralize certain nonregulated financial instruments. Of this amount, $34.6 million was used to offset current and noncurrent risk management liabilities under master netting agreements and the remaining $8.9 million is classified as current risk management assets.
Available for sale securities
Available-for-sale securities are comprised of the following:
 
Amortized
Cost
 
Gross
Unrealized
Gain
 
Gross
Unrealized
Loss
 
Fair
Value
 
(In thousands)
As of September 30, 2016
 
 
 
 
 
 
 
Domestic equity mutual funds
$
26,692

 
$
6,419

 
$
(590
)
 
$
32,521

Foreign equity mutual funds
4,954

 
1,202

 
—

 
6,156

Bonds
31,296

 
108

 
(10
)
 
31,394

Money market funds
2,630

 
—

 
—

 
2,630

 
$
65,572

 
$
7,729

 
$
(600
)
 
$
72,701

As of September 30, 2015
 
 
 
 
 
 
 
Domestic equity mutual funds
$
27,643

 
$
7,332

 
$
(456
)
 
$
34,519

Foreign equity mutual funds
5,261

 
905

 
(66
)
 
6,100

Bonds
32,423

 
106

 
(20
)
 
32,509

Money market funds
1,072

 
—

 
—

 
1,072

 
$
66,399

 
$
8,343

 
$
(542
)
 
$
74,200
Other fair value measurements table
The following table presents the carrying value and fair value of our debt as of September 30, 2016:
 
September 30, 2016
 
(In thousands)
Carrying Amount
$
2,460,000

Fair Value
$
2,844,990