Unusual Items - Summary of Losses Incurred on Repurchase of Debt Instruments (Detail) (4.0625 Percentage Convertible Subordinated Debentures [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Nov. 30, 2013
4.0625 Percentage Convertible Subordinated Debentures [Member]
Unusual or Infrequent Item [Line Items]
Principal amount repurchased	$ 5.2
Cash repurchase price	(10.1)
Write-off of the deferred financing costs	(0.1)
Loss on Debentures repurchased	$ (5.0)

Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

No definition available.

Name:	us-gaap_GainLossOnRepurchaseOfDebtInstrument
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration