Fair Value (Details Textual) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended	9 Months Ended
	Jun. 30, 2013	Apr. 30, 2011	Jul. 30, 2016	Jul. 30, 2016	Oct. 31, 2015	Jun. 03, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate principal amount of debt			$ 1,750,000	$ 1,750,000	$ 875,000
Fair Value (Textual) [Abstract]
Cash and held to maturity investments			$ 58,800	$ 58,800	76,400
3.0% Senior unsecured notes due April 15, 2016 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Frequency of Periodic Payment		semi-annual fixed interest payments due on April 15 and October 15 of each year, commencing October 15, 2011
Debt Instrument, Maturity Date		Apr. 15, 2016
2.875% Senior unsecured notes due June 1, 2023 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Frequency of Periodic Payment	semi-annual fixed interest payments due on June 1 and December 1 of each year, commencing December 1, 2013
Debt Instrument, Maturity Date	Jun. 01, 2023
3.9% Senior unsecured notes due December 15, 2025 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Frequency of Periodic Payment			semi-annual fixed interest payments due on June 15 and December 15 of each year, commencing June 15, 2016
Debt Instrument, Maturity Date	Dec. 15, 2025
5.3% Senior unsecured notes due December 15, 2045 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Frequency of Periodic Payment				semi-annual fixed interest payments due on June 15 and December 15 of each year, commencing June 15, 2016
Debt Instrument, Maturity Date			Dec. 15, 2045
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost of the Company's investments classified as available for sale			$ 3,300,000	$ 3,300,000	2,600,000
Financial Instruments Not Recorded at Fair Value on a Recurring Basis [Member] | 3.0% Senior unsecured notes due April 15, 2016 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of the long-term debt					378,600
Aggregate principal amount of debt		$ 375,000
Interest rate to be paid on long term notes		3.00%
Financial Instruments Not Recorded at Fair Value on a Recurring Basis [Member] | 2.875% Senior unsecured notes due June 1, 2023 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of the long-term debt			500,500	500,500	$ 480,900
Aggregate principal amount of debt						$ 500,000
Interest rate to be paid on long term notes						2.875%
Financial Instruments Not Recorded at Fair Value on a Recurring Basis [Member] | 3.9% Senior unsecured notes due December 15, 2025 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of the long-term debt			904,400	904,400
Aggregate principal amount of debt						$ 850,000
Interest rate to be paid on long term notes						3.90%
Financial Instruments Not Recorded at Fair Value on a Recurring Basis [Member] | 5.3% Senior unsecured notes due December 15, 2045 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of the long-term debt			$ 437,900	$ 437,900
Aggregate principal amount of debt						$ 400,000
Interest rate to be paid on long term notes						5.30%