Financial Instruments (Narrative) (Details) (USD $)	12 Months Ended		1 Months Ended	12 Months Ended			2 Months Ended	12 Months Ended		1 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Mar. 31, 2006 Interest Rate Swap [Member]	Nov. 30, 2013 Maximum [Member]	Nov. 30, 2013 Minimum [Member]	Nov. 30, 2013 7 Day Maximum [Member]	Jun. 30, 2011 Interest Rate Swap [Member]	Nov. 30, 2013 Interest Rate Swap [Member]	Nov. 30, 2013 Interest Rate Swap [Member] Treasury Lock [Member]	Mar. 31, 2006 5.20% Medium-Term Notes Due 2015 [Member]
Derivative [Line Items]
Foreign currency to purchase or sell	$ 204,900,000	$ 188,800,000
Maximum time frame for short-term foreign exchange contracts	7 days
Derivative, Notional Amount			100,000,000			96,100,000			175,000,000
Maturity period for remaining foreign currency contracts (in months)				12 months	1 month
Interest on interest rate swap contracts			5.20%
Cash flow hedges settled in cash for gain (loss)								(9,000,000)
Weighted average fixed interest rate on issuance of notes							3.30%
Aggregate principal amount							250,000,000
Basis spread on variable interest rate derivative contracts, percentage below LIBOR			0.05%
Maturity date of interest rate swap contracts			December 2015
Derivative instruments fair value hedge			100,000,000
Medium-term notes due										200,000,000
Debt instrument interest rate										5.20%
Debt instrument maturity year										2015
Hedge ineffectiveness recognized on interest rate swaps			0
Other comprehensive income (loss) expected to be reclassified in income in next 12 months	600,000
Cost of long-term investments	$ 77,500,000	$ 69,600,000