CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Thousands	Jun. 30, 2011	Sep. 30, 2010
ASSETS
Property, plant and equipment	$ 6,599,950	$ 6,542,318
Less accumulated depreciation and amortization	1,683,899	1,749,243
Net property, plant and equipment	4,916,051	4,793,075
Current assets
Cash and cash equivalents	117,429	131,952
Accounts receivable, net	342,092	273,207
Gas stored underground	256,768	319,038
Other current assets	273,459	150,995
Total current assets	989,748	875,192
Goodwill and intangible assets	739,677	740,148
Deferred charges and other assets	347,994	355,376
Total assets	6,993,470	6,763,791
Shareholders' equity
Common stock, no par value (stated at $.005 per share); 200,000,000 shares authorized; issued and outstanding: June 30, 2011 - 90,284,722 shares; September 30, 2010 - 90,164,103 shares	451	451
Additional paid-in capital	1,730,121	1,714,364
Retained earnings	599,506	486,905
Accumulated other comprehensive income (loss)	5,746	(23,372)
Shareholders' equity	2,335,824	2,178,348
Long-term debt	2,206,106	1,809,551
Total capitalization	4,541,930	3,987,899
Current liabilities
Accounts payable and accrued liabilities	312,205	266,208
Other current liabilities	333,643	413,640
Short-term debt	0	126,100
Current maturities of long-term debt	2,434	360,131
Total current liabilities	648,282	1,166,079
Deferred income taxes	967,607	829,128
Regulatory cost of removal obligation	396,201	350,521
Deferred credits and other liabilities	439,450	430,164
Total shareholders' equity and liabilities	$ 6,993,470	$ 6,763,791