Business Segments Reconciliations To Statements Of Operations (Details) (USD $)	3 Months Ended		6 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011
Net Income [Abstract]
Income Before Income Taxes for Reportable Segments	$ 82,816,000	$ 78,303,000	$ 208,582,000	$ 217,629,000
Income Taxes	(32,624,000)	(30,895,000)	(82,163,000)	(85,781,000)
Net Income	50,192,000	47,408,000	126,419,000	131,848,000
Segment Reconciliation Abstract
Operating Income (Loss) Before Income Taxes	76,846,000	79,082,000	203,780,000	221,767,000
Utility Income Taxes	(28,090,000)	(26,179,000)	(75,311,000)	(78,114,000)
Non-utility Activities Before Income Taxes	26,000	24,000	132,000	143,000
Operating Income	$ 48,782,000	$ 52,927,000	$ 128,601,000	$ 143,796,000