Debt (Details) (USD $)			9 Months Ended
	Aug. 31, 2014	Nov. 30, 2013	Aug. 31, 2014 Minimum [Member]	Aug. 31, 2014 Maximum [Member]	Aug. 31, 2014 2012 term loan [Member]	Aug. 31, 2014 2013 term loan [Member]	Aug. 31, 2014 Credit facility term loans [Member]	Nov. 30, 2013 Credit facility term loans [Member]	Aug. 31, 2014 2012 term loan [Member]	Nov. 30, 2013 2012 term loan [Member]	Aug. 31, 2014 2013 term loan [Member]	Nov. 30, 2013 2013 term loan [Member]
Line of Credit Facility [Line Items]
Short-term debt	$ 218,793,000	$ 395,527,000
Long-term debt	1,681,483,000	1,779,065,000
Long-term Debt, Weighted Average Interest Rate	2.15%
Line of Credit Facility, Maximum Borrowing Capacity	1,000,000,000
Debt instrument, face amount					250,000,000	700,000,000
Line of Credit Facility, Interest Rate Description			LIBOR plus a spread of 1.00 percent	LIBOR plus a spread of 2.25 percent
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.15%	0.40%
Line of Credit Facility, Amount Outstanding	600,000,000	770,000,000
Long-term Debt	1,293,037,000						368,037,000	446,904,000	250,000,000	250,000,000	675,000,000	700,000,000
Capital Lease Obligations	7,239,000	7,688,000
Debt and Capital Lease Obligations	1,900,276,000	2,174,592,000
Line of Credit Facility, Interest Rate at Period End	1.94%
Letters of Credit Outstanding under Credit Facility	$ 700,000