Fair Value Disclosures - Investments Measured at Fair Value Based on Net Asset Value Per Share (Footnote) (Detail)	3 Months Ended
	Feb. 28, 2017	Nov. 30, 2016
Equity Long/Short Hedge Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Percentage of investment at fair value in liquidation	1.00%	2.00%
Private equity funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated period for the liquidation of the underlying assets, Minimum	1 year
Estimated period for the liquidation of the underlying assets, Maximum	6 years
Multi-asset Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Percentage of redeemable investments	13.00%	12.00%
Minimum [Member] | Multi-asset Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notice period redemption of investment prior written notice period	30 days
Maximum [Member] | Multi-asset Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notice period redemption of investment prior written notice period	90 days