Stockholders' Equity (Details) (USD $)	3 Months Ended		6 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Accumulated Other Comprehensive Income Loss [Abstract]
Accumulated OCIL beginning balance, net of tax	$ 27,000	$ (463,000)	$ (284,000)	$ (305,000)
OCIL before reclassifications, net of tax	352,000	238,000	526,000	59,000
Amounts reclassified from accumulated OCIL, net of tax	(359,000)	76,000	(222,000)	97,000
Total other comprehensive income (loss)	(7,000)	314,000	304,000	156,000
Accumulated OCIL ending balance, net of tax	20,000	(149,000)	20,000	(149,000)
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income from equity method investments	14,360,000	12,437,000	24,302,000	19,592,000
Income taxes	(4,604,000)	(4,875,000)	(8,332,000)	(7,549,000)
Net Income	62,540,000	55,790,000	160,112,000	141,713,000
Stockholders' Equity [Abstract]
Common Stock, Shares, Outstanding, Beginning Balance			76,099,000
Common Stock, Value, Issued, Beginning Balance			561,644,000
Stock Issued During Period Shares Employee Stock Purchase Plans			18,000
Stock Issued During Period Value Employee Stock Purchase Plan			566,000
Stock Issued During Period Shares Dividend Reinvestment And Stock Purchase Plans			330,000
Stock Issued During Period Value Dividend Reinvestment And Stock Purchase Plans			10,826,000
Stock Issued During Period Shares Incentive Compensation Plan			91,000
Stock Issued During Period Value Incentive Compensation Plan			2,993,000
Stock Issued During Period Shares through forward sales agreements			1,600,000
Stock Issued During Period Value through forward sales agreements, net of expenses			47,290,000
Common Stock, Shares, Outstanding, Ending Balance	78,138,000		78,138,000
Common Stock, Value, Issued, Ending Balance	623,319,000		623,319,000
Cash Dividends Per Share of Common Stock	$ 0.32	$ 0.31	$ 0.63	$ 0.61
Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income from equity method investments	587,000	(125,000)	362,000	(160,000)
Income taxes	(228,000)	49,000	(140,000)	63,000
Net Income	$ 359,000	$ (76,000)	$ 222,000	$ (97,000)