Restructuring Charges (Summary of Restructuring Activity) (Details) (USD $)	3 Months Ended
	Feb. 28, 2013	Feb. 29, 2012
Restructuring Reserve [Roll Forward]
Costs incurred	$ 960,000	$ 0
2012 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period	7,032,000
Costs incurred	1,375,000
Cash disbursements	(5,764,000)
Asset impairment	(111,000)
Translation adjustments and other	20,000
Balance at the end of the period	2,552,000
2012 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period	603,000
Costs incurred	962,000
Cash disbursements	(290,000)
Asset impairment	(111,000)
Translation adjustments and other	(3,000)
Balance at the end of the period	1,161,000
2012 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period	6,429,000
Costs incurred	413,000
Cash disbursements	(5,474,000)
Asset impairment	0
Translation adjustments and other	23,000
Balance at the end of the period	$ 1,391,000