Derivative Financial Instruments - Remaining Contract Maturity of Fair Value of OTC Derivative Assets and Liabilities (Footnote) (Detail) $ in Millions	Nov. 30, 2015 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Exchange traded derivative assets	$ 20.4
Cash collateral received	144.4
Exchange traded derivative liabilities, with fair value	78.4
Cash collateral pledged	$ 237.0