Restructuring Charges (Summary of Restructuring Activity) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2014	Aug. 31, 2013
Restructuring Reserve [Roll Forward]
Costs incurred	$ (1,680)	$ (5,401)	$ (2,001)	$ (9,127)
2013 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2013			1,646
Costs incurred			317
Cash disbursements			(1,653)
Translation adjustments and other			0
Balance, August 31, 2014	310		310
2013 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2013			569
Costs incurred			250
Cash disbursements			(507)
Translation adjustments and other			(2)
Balance, August 31, 2014	310		310
2013 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2013			1,077
Costs incurred			67
Cash disbursements			(1,146)
Translation adjustments and other			2
Balance, August 31, 2014	0		0
2012 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2013			906
Costs incurred			198
Cash disbursements			(752)
Translation adjustments and other			(9)
Balance, August 31, 2014	343		343
2012 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2013			615
Costs incurred			219
Cash disbursements			(480)
Translation adjustments and other			(11)
Balance, August 31, 2014	343		343
2012 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2013			291
Costs incurred			(21)
Cash disbursements			(272)
Translation adjustments and other			2
Balance, August 31, 2014	$ 0		$ 0