Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014
Current assets:
Cash and cash equivalents	$ 16,522	$ 12,401	$ 28,480
Restricted cash	3,683	3,592	1,109
Accounts receivable (less allowances for doubtful accounts of $12,534, $6,992 and $13,517, respectively)	89,340	65,080	97,144
Accounts receivable — related parties	2,039	2,865	3,484
Accrued utility revenues	7,716	14,330	7,950
Inventories	33,376	95,219	58,750
Deferred income taxes	29,904	1,492	11,908
Regulatory assets	2,763	13,159	9,354
Derivative instruments	1,285	1,028	1,703
Prepaid expenses & other current assets	13,551	18,535	11,057
Total current assets	200,179	227,701	230,939
Property, plant and equipment, at cost (less accumulated depreciation and amortization of $918,311, $886,268 and $888,279, respectively)	1,781,668	1,682,284	1,635,867
Goodwill	182,145	182,145	182,145
Regulatory assets	251,479	255,007	233,272
Derivative instruments	111	0	0
Other assets	7,623	7,506	7,618
Total assets	2,423,205	2,354,643	2,289,841
Current liabilities:
Current maturities of long-term debt	72,000	20,000	20,000
Short-term borrowings	2,700	86,300	0
Accounts payable	44,687	58,453	47,396
Accounts payable — related parties	5,477	11,761	21,131
Deferred fuel refunds	45,564	306	0
Derivative instruments	4,412	1,632	31
Other current liabilities	151,760	99,030	140,404
Total current liabilities	326,600	277,482	228,962
Long-term debt	550,000	622,000	622,000
Deferred income taxes	478,108	461,461	454,871
Deferred investment tax credits	3,681	3,933	4,017
Pension and postretirement benefit obligations	91,804	98,363	61,991
Other noncurrent liabilities	50,752	51,567	53,439
Total liabilities	$ 1,500,945	$ 1,514,806	$ 1,425,280
Commitments and contingencies
Common stockholder’s equity:
Common Stock, $2.25 par value (authorized — 40,000,000 shares; issued and outstanding — 26,781,785 shares)	$ 60,259	$ 60,259	$ 60,259
Additional paid-in capital	471,796	471,071	470,844
Retained earnings	396,823	316,688	340,714
Accumulated other comprehensive loss	(6,618)	(8,181)	(7,256)
Total common stockholder’s equity	922,260	839,837	864,561
Total liabilities and stockholder’s equity	$ 2,423,205	$ 2,354,643	$ 2,289,841