Balance Sheet Accounts - Estimated Fair Value and Principal Amount of Outstanding Debt (Detail) (USD $) In Millions, unless otherwise specified	May 31, 2014	Nov. 30, 2013
Debt Instrument [Line Items]
Fair Value	$ 979.3	$ 938.6
Principal Amount	783.0	699.2
Term Loan [Member]
Debt Instrument [Line Items]
Fair Value	100.0	45.0
Principal Amount	100.0	45.0
7.125% Second-Priority Senior Secured Notes [Member]
Debt Instrument [Line Items]
Fair Value	502.0	494.5
Principal Amount	460.0	460.0
4.0625% Debentures [Member]
Debt Instrument [Line Items]
Fair Value	297.3	398.1
Principal Amount	143.0	193.2
Delayed Draw Term Loan [Member]
Debt Instrument [Line Items]
Fair Value	79.0	0
Principal Amount	79.0	0
Other Debt [Member]
Debt Instrument [Line Items]
Fair Value	1.0	1.0
Principal Amount	$ 1.0	$ 1.0