Earnings per Share - Basic and Diluted Earnings per Common Share (Parenthetical) (Detail) (Predecessor [Member], USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Feb. 28, 2013	Nov. 30, 2012	Nov. 30, 2011
Predecessor [Member]
Earnings Per Share [Line Items]
Weighted average shares of participating securities	16,756,000	14,123,000	10,667,000
Dividends declared on participating securities	$ 1.3	$ 4.3	$ 3.4

This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 10: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details