Business Segments (Details) (USD $)	3 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
Segment Reporting Information [Line Items]
Revenues from External Customers	$ 657,733,000	$ 515,875,000
Margin	261,512,000	231,623,000
Operations And Maintenance Expenses	60,668,000	55,941,000
Income From Equity Method Investments	9,941,000	7,155,000
Operating Income (Loss) Before Income Taxes	162,012,000	139,377,000
Income (Loss) Before Income Taxes	161,102,000	141,896,000
Number Of Operating Segments	2
Regulated Operation [Member]
Segment Reporting Information [Line Items]
Revenues from External Customers	657,733,000	515,875,000
Margin	261,512,000	231,623,000
Operations And Maintenance Expenses	60,639,000	55,882,000
Income From Equity Method Investments	0	0
Operating Income (Loss) Before Income Taxes	162,121,000	139,512,000
Income (Loss) Before Income Taxes	151,269,000	134,877,000
Non Utility Activities [Member]
Segment Reporting Information [Line Items]
Revenues from External Customers	0	0
Margin	0	0
Operations And Maintenance Expenses	29,000	59,000
Income From Equity Method Investments	9,941,000	7,155,000
Operating Income (Loss) Before Income Taxes	(109,000)	(135,000)
Income (Loss) Before Income Taxes	$ 9,833,000	$ 7,019,000