Derivatives (Details)	3 Months Ended		9 Months Ended					3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended													9 Months Ended
	Aug. 31, 2014 USD ($)	Aug. 31, 2013 USD ($)	Aug. 31, 2014 USD ($)	Aug. 31, 2013 USD ($)	Nov. 30, 2013 USD ($)	Aug. 31, 2014 Foreign currency forward contract to buy USD with CAD [Member] USD ($)	Nov. 30, 2013 Foreign currency forward contract to buy USD with CAD [Member] USD ($)	Aug. 31, 2014 Interest Rate Swap [Member] USD ($)	Aug. 31, 2013 Interest Rate Swap [Member] USD ($)	Aug. 31, 2014 Interest Rate Swap [Member] USD ($)	Aug. 31, 2013 Interest Rate Swap [Member] USD ($)	Aug. 31, 2014 Forward-starting interest rate swap [Member] USD ($)	Aug. 31, 2014 Foreign currency forward cash flow hedge [Member] USD ($)	Aug. 31, 2013 Foreign currency forward cash flow hedge [Member] USD ($)	Aug. 31, 2014 Foreign currency forward cash flow hedge [Member] USD ($)	Aug. 31, 2013 Foreign currency forward cash flow hedge [Member] USD ($)	Nov. 30, 2013 Foreign currency forward cash flow hedge [Member] USD ($)	Aug. 31, 2014 Foreign currency forward contract to buy CAD with GBP [Member] CAD	Nov. 30, 2013 Foreign currency forward contract to buy CAD with GBP [Member] CAD	Aug. 31, 2014 Foreign currency forward contract to buy USD with EUR [Member] USD ($)	Nov. 30, 2013 Foreign currency forward contract to buy USD with EUR [Member] USD ($)	Aug. 31, 2014 Foreign currency forward contract to buy CHF with USD [Member] USD ($)	Nov. 30, 2013 Foreign currency forward contract to buy CHF with USD [Member] USD ($)	Aug. 31, 2014 Foreign currency forward contract to buy GBP with EUR [Member] GBP (£)	Nov. 30, 2013 Foreign currency forward contract to buy GBP with EUR [Member] GBP (£)	Aug. 31, 2014 Foreign currency forward contract to buy USD with GBP [Member] GBP (£)	Nov. 30, 2013 Foreign currency forward contract to buy USD with GBP [Member] GBP (£)	Aug. 31, 2014 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] USD ($)	May 31, 2014 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] USD ($)	Nov. 30, 2013 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] USD ($)	Aug. 31, 2013 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] USD ($)	May 31, 2013 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] USD ($)	Nov. 30, 2012 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] USD ($)
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount						$ 58,734,000	$ 142,606,000	$ 100,000,000		$ 100,000,000		$ 400,000,000	$ 15,000,000		$ 15,000,000		$ 15,900,000	0	28,741,000	$ 13,401,000	$ 17,522,000	$ 14,373,000	$ 15,308,000	£ 4,815,000	£ 5,866,000	£ 4,797,000	£ 1,863,000
Derivative, Average Fixed Interest Rate								1.80%		1.80%		2.86%
Accumulated other comprehensive loss	(62,807,000)		(62,807,000)		(56,961,000)																							(6,687,000)	(6,963,000)	(2,199,000)	(1,350,000)	(1,664,000)	(2,225,000)
Unrealized gain (loss) on hedging activities	276,000	314,000	(4,488,000)	875,000				(366,000)	9,000	(5,645,000)	42,000		212,000	67,000	41,000	152,000												(5,604,000)
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	392,000	1,835,000	1,323,000	5,790,000
Foreign Currency Cash Flow Hedge Asset at Fair Value	547,000		547,000		8,000
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	418,000		418,000		1,548,000
Derivative Asset, Fair Value, Gross Asset	965,000		965,000		1,556,000
Interest Rate Cash Flow Hedge Liability at Fair Value	11,601,000		11,601,000		3,366,000
Foreign Currency Cash Flow Hedge Liability at Fair Value	0		0		423,000
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	291,000		291,000		957,000
Derivative Liability, Fair Value, Gross Liability	11,892,000		11,892,000		4,746,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months										1,300,000
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion								$ 239,000	$ 235,000	$ 713,000	$ 696,000		$ 191,000	$ 3,000	$ 403,000	$ (15,000)												$ 1,116,000