Restructuring Charges (Summary of Restructuring Activity) (Details) (USD $)	9 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
2010 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2011	$ 5,611,000
Costs incurred		0
Cash disbursements	(2,339,000)
Translation adjustments and other	115,000
Balance, August 31, 2012	3,387,000
2010 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2011	4,913,000
Cash disbursements	(2,067,000)
Translation adjustments and other	110,000
Balance, August 31, 2012	2,956,000
2010 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2011	698,000
Cash disbursements	(272,000)
Translation adjustments and other	5,000
Balance, August 31, 2012	431,000
2012 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2011	0
Costs incurred	13,705,000
Cash disbursements	(5,288,000)
Asset impairment	(875,000)
Translation adjustments and other	(13,000)
Balance, August 31, 2012	7,529,000
2012 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2011	0
Costs incurred	1,967,000
Cash disbursements	(597,000)
Asset impairment	(875,000)
Translation adjustments and other	0
Balance, August 31, 2012	495,000
2012 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Balance, December 1, 2011	0
Costs incurred	11,738,000
Cash disbursements	(4,691,000)
Translation adjustments and other	(13,000)
Balance, August 31, 2012	$ 7,034,000