Derivatives Unrecognized hedging losses in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2016	May 31, 2015
Hedging activities in AOCI [Roll Forward]
Beginning balance			$ (191,213)
Unrealized loss on hedging activities	$ 2,302	$ (1,535)	(1,697)	$ (2,954)
Ending balance	(182,571)		(182,571)
Interest Rate Swap [Member]
Hedging activities in AOCI [Roll Forward]
Unrealized loss on hedging activities	997	(1,690)	(4,408)	(3,495)
Loss reclassified from AOCI into income	1,379	280	2,882	508
Foreign currency forward cash flow hedge [Member]
Hedging activities in AOCI [Roll Forward]
Unrealized loss on hedging activities	0	312	0	824
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Hedging activities in AOCI [Roll Forward]
Beginning balance	(18,556)	(10,901)	(14,557)	(9,482)
Unrealized loss on hedging activities			(4,408)
Loss reclassified from AOCI into income			2,711
Ending balance	$ (16,254)	$ (12,436)	$ (16,254)	$ (12,436)