Restructuring Charges (Summary of Restructuring Activity) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013
Restructuring Reserve [Roll Forward]
Costs incurred	$ 124	$ 2,766	$ 320	$ 3,726
2013 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2013			1,646
Costs incurred			201
Cash disbursements			(1,508)
Translation adjustments and other			8
Balance, May 31, 2014	347		347
2013 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2013			569
Costs incurred			169
Cash disbursements			(401)
Translation adjustments and other			5
Balance, May 31, 2014	342		342
2013 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2013			1,077
Costs incurred			32
Cash disbursements			(1,107)
Translation adjustments and other			3
Balance, May 31, 2014	5		5
2012 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2013			906
Costs incurred			119
Cash disbursements			(625)
Translation adjustments and other			(3)
Balance, May 31, 2014	397		397
2012 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2013			615
Costs incurred			140
Cash disbursements			(353)
Translation adjustments and other			(5)
Balance, May 31, 2014	397		397
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, May 31, 2014	$ 0		$ 0