Stockholders' Equity (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Jan. 07, 2015	Jan. 31, 2015	Jan. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income from equity method investments		$ 8,265,000	$ 9,941,000
Income taxes		(3,264,000)	(3,728,000)
Net income		92,978,000	97,572,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding, Beginning Balance		78,531
Common Stock, Value, Issued, Beginning Balance		636,835,000
Issued to participants in the Employee Stock Purchase Plan (ESPP) (in shares)		7
Issued to participants in the Employee Stock Purchase Plan (ESPP)		279,000
Issued to participants in the Dividend Reinvestment and Stock Purchase Plan (in shares)		126
Issued to participants in the Dividend Reinvestment and Stock Purchase Plan		4,781,000
Issued to participants in the Incentive Compensation Plan (ICP) (in shares)		103
Issued to participants in the Incentive Compensation Plan (ICP)		3,935,000
Costs from issuance of common stock		(137,000)
Common Stock, Shares, Outstanding, Ending Balance		78,767
Common Stock, Value, Issued, Ending Balance		645,693,000
ATM Sales Agreement Aggregate Amount	170,000,000
ATM Sales Agreement Commission Percentage	1.50%
Cash dividends paid per share of common stock (usd per share)		$ 0.32	$ 0.31
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated OCIL beginning balance, net of tax		(237,000)	(284,000)
Total other comprehensive income (loss)		(827,000)	311,000
Accumulated OCIL ending balance, net of tax		(1,064,000)	27,000
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income		117,000	137,000
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
OCIL before reclassifications, net of tax		(944,000)	174,000
Amounts reclassified from accumulated OCIL, net of tax		117,000	137,000
Total other comprehensive income (loss)		(827,000)	311,000
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income from equity method investments		192,000	225,000
Income taxes		(75,000)	(88,000)
Net income		117,000	137,000
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total other comprehensive income (loss)		0
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income from equity method investments		0
Income taxes		0
Net income		$ 0