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Fair Value Measurements (Table)
 9 Months Ended
Jun. 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 June 30, 2016 and September 30, 2015. 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)
 
June 30, 2016
 
(In thousands)
Assets:
 
 
 
 
 
 
 
 
 
Financial instruments
 
 
 
 
 
 
 
 
 
Regulated distribution segment
$
—

 
$
4,401

 
$
—

 
$
—

 
$
4,401

Nonregulated segment
—

 
52,119

 
—

 
(47,164
)
 
4,955

Total financial instruments
—

 
56,520

 
—

 
(47,164
)
 
9,356

Hedged portion of gas stored underground
97,860

 
—

 
—

 
—

 
97,860

Available-for-sale securities
 
 
 
 
 
 
 
 
 
Money market funds
—

 
1,358

 
—

 
—

 
1,358

Registered investment companies
39,068

 
—

 
—

 
—

 
39,068

Bonds
—

 
31,319

 
—

 
—

 
31,319

Total available-for-sale securities
39,068

 
32,677

 
—

 
—

 
71,745

Total assets
$
136,928

 
$
89,197

 
$
—

 
$
(47,164
)
 
$
178,961

Liabilities:
 
 
 
 
 
 
 
 
 
Financial instruments
 
 
 
 
 
 
 
 
 
Regulated distribution segment
$
—

 
$
249,704

 
$
—

 
$
(16,330
)
 
$
233,374

Nonregulated segment
—

 
69,901

 
—

 
(69,901
)
 
—

Total liabilities
$
—

 
$
319,605

 
$
—

 
$
(86,231
)
 
$
233,374

 
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 June 30, 2016, we had $16.3 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 June 30, 2016, we also had $22.7 million of cash held in margin accounts to collateralize certain nonregulated financial instruments. Of this amount, $18.7 million was used to offset current and noncurrent risk management liabilities under master netting arrangements with the remaining $4.0 million 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 arrangements with the remaining $8.9 million is classified as current risk management assets.
Schedule of Available-for-sale Securities Reconciliation Table
Available-for-sale securities are comprised of the following:
 
Amortized
Cost
 
Gross
Unrealized
Gain
 
Gross
Unrealized
Loss
 
Fair
Value
 
(In thousands)
As of June 30, 2016
 
 
 
 
 
 
 
Domestic equity mutual funds
$
28,377

 
$
5,549

 
$
(962
)
 
$
32,964

Foreign equity mutual funds
5,357

 
747

 
—

 
6,104

Bonds
31,147

 
175

 
(3
)
 
31,319

Money market funds
1,358

 
—

 
—

 
1,358

 
$
66,239

 
$
6,471

 
$
(965
)
 
$
71,745

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 June 30, 2016 and September 30, 2015:
 
June 30, 2016
 
September 30, 2015
 
(In thousands)
Carrying Amount
$
2,460,000

 
$
2,460,000

Fair Value
$
2,858,540

 
$
2,669,323