Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	Feb. 29, 2016	Nov. 30, 2015
Fair Value, Inputs, Level 1
Fair Value, Measurement Inputs, Disclosure [Line Items]
Money market funds	$ 63.1
Fair Value, Inputs, Level 2
Fair Value, Measurement Inputs, Disclosure [Line Items]
Long-term debt excluding credit facilities, fair value	290.6	$ 284.8
Long-term debt excluding credit facilities, carrying amount	$ 268.2	$ 268.4