Fair Value Measurements (Table)

9 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

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, 2018 and September 30, 2017. 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		June 30, 2018
	(In thousands)
Assets:
Financial instruments	$	—	$	977	$	—	$	—	$	977
Available-for-sale securities
Registered investment companies	43,548		—		—		—		43,548
Bond mutual funds	21,378		—		—		—		21,378
Bonds	—		30,303		—		—		30,303
Money market funds	—		2,195		—		—		2,195
Total available-for-sale securities	64,926		32,498		—		—		97,424
Total assets	$	64,926	$	33,475	$	—	$	—	$	98,401
Liabilities:
Financial instruments	$	—	$	76,504	$	—	$	—	$	76,504

	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)(1)		Significant Other Unobservable Inputs (Level 3)		Netting and Cash Collateral		September 30, 2017
	(In thousands)
Assets:
Financial instruments	$	—	$	3,239	$	—	$	—	$	3,239
Available-for-sale securities
Registered investment companies	41,097		—		—		—		41,097
Bond mutual funds	16,371		—		—		—		16,371
Bonds	—		29,104		—		—		29,104
Money market funds	—		1,837		—		—		1,837
Total available-for-sale securities	57,468		30,941		—		—		88,409
Total assets	$	57,468	$	34,180	$	—	$	—	$	91,648
Liabilities:
Financial instruments	$	—	$	112,398	$	—	$	—	$	112,398

(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 that are valued at cost.

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, 2018
Domestic equity mutual funds	$	28,283	$	8,973	$	(293	)	$	36,963
Foreign equity mutual funds	4,656		1,929		—			6,585
Bond mutual funds	21,673		—		(295		)	21,378
Bonds	30,434		8		(139		)	30,303
Money market funds	2,195		—		—			2,195
	$	87,241	$	10,910	$	(727	)	$	97,424
As of September 30, 2017
Domestic equity mutual funds	$	25,361	$	8,920	$	—		$	34,281
Foreign equity mutual funds	4,581		2,235		—			6,816
Bond mutual funds	16,391		2		(22		)	16,371
Bonds	29,074		46		(16		)	29,104
Money market funds	1,837		—		—			1,837
	$	77,244	$	11,203	$	(38	)	$	88,409

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

The following table presents the carrying value and fair value of our debt as of June 30, 2018 and September 30, 2017:

	June 30, 2018		September 30, 2017
	(In thousands)
Carrying Amount	$	3,085,000	$	3,085,000
Fair Value	$	3,216,893	$	3,382,272