Derivatives (Details)	3 Months Ended		6 Months Ended					3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended													6 Months Ended
	May 31, 2014 USD ($)	May 31, 2013 USD ($)	May 31, 2014 USD ($)	May 31, 2013 USD ($)	Nov. 30, 2013 USD ($)	May 31, 2014 Foreign currency forward contract to buy USD with CAD [Member] USD ($)	Nov. 30, 2013 Foreign currency forward contract to buy USD with CAD [Member] USD ($)	May 31, 2014 Interest Rate Swap [Member] USD ($)	May 31, 2013 Interest Rate Swap [Member] USD ($)	May 31, 2014 Interest Rate Swap [Member] USD ($)	May 31, 2013 Interest Rate Swap [Member] USD ($)	May 31, 2014 Forward-starting interest rate swap [Member] USD ($)	May 31, 2014 Foreign currency forward cash flow hedge [Member] USD ($)	May 31, 2013 Foreign currency forward cash flow hedge [Member] USD ($)	May 31, 2014 Foreign currency forward cash flow hedge [Member] USD ($)	May 31, 2013 Foreign currency forward cash flow hedge [Member] USD ($)	Nov. 30, 2013 Foreign currency forward cash flow hedge [Member] USD ($)	May 31, 2014 Foreign currency forward contract to buy CAD with GBP [Member] CAD	Nov. 30, 2013 Foreign currency forward contract to buy CAD with GBP [Member] CAD	May 31, 2014 Foreign currency forward contract to buy USD with EUR [Member] USD ($)	Nov. 30, 2013 Foreign currency forward contract to buy USD with EUR [Member] USD ($)	May 31, 2014 Foreign currency forward contract to buy CHF with USD [Member] USD ($)	Nov. 30, 2013 Foreign currency forward contract to buy CHF with USD [Member] USD ($)	May 31, 2014 Foreign currency forward contract to buy GBP with EUR [Member] GBP (£)	Nov. 30, 2013 Foreign currency forward contract to buy GBP with EUR [Member] GBP (£)	May 31, 2014 Foreign currency forward contract to buy USD with GBP [Member] GBP (£)	Nov. 30, 2013 Foreign currency forward contract to buy USD with GBP [Member] GBP (£)	May 31, 2014 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] USD ($)	Feb. 28, 2014 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] USD ($)	Nov. 30, 2013 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] USD ($)	May 31, 2013 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] USD ($)	Feb. 28, 2013 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] USD ($)	Nov. 30, 2012 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] USD ($)
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount						$ 61,557,000	$ 142,606,000	$ 100,000,000		$ 100,000,000		$ 400,000,000	$ 16,200,000		$ 16,200,000		$ 15,900,000	0	28,741,000	$ 20,567,000	$ 17,522,000	$ 13,504,000	$ 15,308,000	£ 5,720,000	£ 5,866,000	£ 2,982,000	£ 1,863,000
Derivative, Average Fixed Interest Rate								1.80%		1.80%		2.86%
Accumulated other comprehensive loss	(58,641,000)		(58,641,000)		(56,961,000)																							(6,963,000)	(4,674,000)	(2,199,000)	(1,664,000)	(2,057,000)	(2,225,000)
Unrealized gain (loss) on hedging activities	(2,289,000)	393,000	(4,764,000)	561,000				(2,792,000)	55,000	(5,279,000)	33,000		120,000	143,000	(171,000)	85,000												(5,450,000)
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	(1,274,000)	1,598,000	931,000	3,955,000
Foreign Currency Cash Flow Hedge Asset at Fair Value	67,000		67,000		8,000
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	160,000		160,000		1,548,000
Derivative Asset, Fair Value, Gross Asset	227,000		227,000		1,556,000
Interest Rate Cash Flow Hedge Liability at Fair Value	11,392,000		11,392,000		3,366,000
Foreign Currency Cash Flow Hedge Liability at Fair Value	185,000		185,000		423,000
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	294,000		294,000		957,000
Derivative Liability, Fair Value, Gross Liability	11,871,000		11,871,000		4,746,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months										900,000
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion								$ 239,000	$ 235,000	$ 474,000	$ 461,000		$ 144,000	$ (40,000)	$ 212,000	$ (18,000)												$ 686,000