CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010
ASSETS
Property, plant and equipment	$ 6,607,552	$ 6,384,396
Construction in progress	209,242	157,922
Total property, plant and equipment and construction in progress	6,816,794	6,542,318
Less accumulated depreciation and amortization	1,668,876	1,749,243
Net property, plant and equipment	5,147,918	4,793,075
Current assets
Cash and cash equivalents	131,419	131,952
Accounts receivable, net	273,303	273,207
Gas stored underground	289,760	319,038
Other current assets	316,471	150,995
Total current assets	1,010,953	875,192
Goodwill and intangible assets	740,207	740,148
Deferred charges and other assets	383,793	355,376
Total assets	7,282,871	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	1,732,935	1,714,364
Retained earnings	570,495	486,905
Accumulated other comprehensive income (loss)	(48,460)	(23,372)
Shareholders' equity	2,255,421	2,178,348
Long-term debt	2,206,117	1,809,551
Total capitalization	4,461,538	3,987,899
Current liabilities
Accounts payable and accrued liabilities	291,205	266,208
Other current liabilities	367,563	413,640
Short-term debt	206,396	126,100
Current maturities of long-term debt	2,434	360,131
Total current liabilities	867,598	1,166,079
Deferred income taxes	960,093	829,128
Regulatory cost of removal obligation	428,947	350,521
Deferred credits and other liabilities	564,695	430,164
Total shareholders' equity and liabilities	$ 7,282,871	$ 6,763,791