Financial Instruments (Narrative) (Details) - USD ($)	1 Months Ended		12 Months Ended
	Nov. 30, 2015	Mar. 31, 2006	Nov. 30, 2016	Nov. 30, 2015
Derivative [Line Items]
Other comprehensive income (loss) expected to be reclassified in income in next 12 months			$ 3,400,000
Cost of long-term investments	$ 80,000,000		80,600,000	$ 80,000,000
Fair Value, Concentration of Risk, Accounts Receivable			0.09
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Foreign currency to purchase or sell	$ 264,500,000		$ 449,200,000	$ 264,500,000
Maximum time frame for short-term foreign exchange contracts			12 months
Derivative, Notional Amount			$ 189,400,000
Derivative, Term of Contract			7 days
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 100,000,000	$ 100,000,000
Interest on interest rate swap contracts		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			3.45%
Aggregate principal amount			$ 250,000,000
Interest Rate Swap [Member] | Treasury Lock [Member]
Derivative [Line Items]
Derivative, Notional Amount			100,000,000
3.25% Notes Due 2025 [Member]
Derivative [Line Items]
Medium-term notes due			$ 250,000,000
Stated Note interest rate			3.25%
5.20% Medium-Term Notes Due 2015 [Member]
Derivative [Line Items]
Medium-term notes due		$ 200,000,000
Stated Note interest rate		5.20%