Financial Instruments (Narrative) (Details) - USD ($)		1 Months Ended		12 Months Ended
		Nov. 30, 2015	Mar. 31, 2006	Nov. 30, 2015	Nov. 30, 2014
Derivative [Line Items]
Other comprehensive income (loss) expected to be reclassified in income in next 12 months		$ 2,800,000		$ 2,800,000
Cost of long-term investments		80,000,000		80,000,000	$ 80,100,000
Fair Value, Concentration of Risk, Accounts Receivable		0.12		0.12
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Foreign currency to purchase or sell		264,500,000		$ 264,500,000	$ 262,700,000
Maximum time frame for short-term foreign exchange contracts				12 months
Derivative, Notional Amount		140,100,000		$ 140,100,000
Derivative, Term of Contract				7 days
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 100,000,000	$ 100,000,000	$ 100,000,000
Interest on interest rate swap contracts		3.25%	5.20%	3.25%
Derivative Instrument Basis Spread Increase On Variable Rate		1.22%
Basis spread on variable interest rate derivative contracts, percentage below LIBOR			0.05%
Derivative instruments fair value hedge			$ 100,000,000
Maximum [Member]
Derivative [Line Items]
Maturity period for remaining foreign currency contracts (in months)					12 months
Minimum [Member]
Derivative [Line Items]
Maturity period for remaining foreign currency contracts (in months)					1 month
Interest Rate Swap [Member]
Derivative [Line Items]
Cash flow hedges settled in cash for gain (loss)				$ (1,200,000)
Weighted average fixed interest rate on issuance of notes	[1]			3.45%
Aggregate principal amount	[1]	$ 250,000,000		$ 250,000,000
Interest Rate Swap [Member] | Treasury Lock [Member]
Derivative [Line Items]
Derivative, Notional Amount		100,000,000		100,000,000
3.25% Notes Due 2025 [Member]
Derivative [Line Items]
Medium-term notes due	[1]	$ 250,000,000		$ 250,000,000
Debt instrument interest rate		3.25%		3.25%
5.20% Medium-Term Notes Due 2015 [Member]
Derivative [Line Items]
Medium-term notes due			$ 200,000,000
Debt instrument interest rate			5.20%
Debt instrument maturity year			2015

[1] The fixed interest rate on $100 million of the 3.25% notes due in 2025 is effectively converted to a variable rate by interest rate swaps through 2025. Net interest payments are based on 3 month LIBOR plus 1.22% during this period (our effective rate as of November 30, 2015 was 1.58%). In addition, separate interest rate swaps, settled upon the issuance of these notes in 2015, effectively fixed the interest rate on the $250 million notes at a weighted-average fixed rate of 3.45%