Benefit Plans (Details) (USD $)	3 Months Ended	9 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended	2 Months Ended
	Aug. 31, 2011	Aug. 31, 2011	Aug. 31, 2011 Pension Plans [Member]	Aug. 31, 2010 Pension Plans [Member]	Aug. 31, 2010 Pension Plans [Member]	Aug. 31, 2011 Pension Plans [Member]	Aug. 31, 2011 German Pension Plan [Member]
Net pension cost included the following components:
Service cost			$ 44,000	$ 50,000	$ 134,000	$ 131,000	$ 6,000,000
Interest cost on projected benefit obligation			591,000	603,000	1,630,000	1,774,000	184,000,000
Expected return on plan assets			(644,000)	(644,000)	(1,738,000)	(1,933,000)
Net amortization			223,000	171,000	464,000	671,000
Net periodic pension cost			214,000	180,000	490,000	643,000	190,000,000
Liability recognized under employee benefit plan							21,800,000
Contribution to pension plan during the fiscal year	0	0					0
Benefit Plans (Textuals) [Abstract]
Percentage of returns amortized in net periodic pension calculations		10.00%
Further benefit accruals for future service		0
Contribution to pension plan	$ 2,000,000	$ 2,000,000