Financial Instruments (Details 1) (USD $) In Thousands	9 Months Ended	11 Months Ended
	Aug. 31, 2011	Nov. 30, 2010
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 64,923	$ 50,902
Unfunded Commitments	6,025	6,923
Equity Long/Short Hedge Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	27,282	19,865
Unfunded Commitments	0	0
Redemption Frequency (if currently eligible)	Monthly, Quarterly, Semiannually	Quarterly, Semiannually
High Yield Hedge Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	993	1,561
Unfunded Commitments	0	0
Fund of Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	881	2,622
Unfunded Commitments	127	131
Redemption Frequency (if currently eligible)	Annually	Annually
Private Equity Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	21,198	26,567
Unfunded Commitments	5,897	6,792
Commodity Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	14,569
Unfunded Commitments	0
Redemption Frequency (if currently eligible)	Bi- Monthly
Other Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value		287
Unfunded Commitments		$ 0
Redemption Frequency (if currently eligible)		At Will