Discontinued Operations - Summarized Financial Information for Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010
Net sales
Income before income taxes		0.3	(0.1)	0.3	2.6		0.7
Income tax (provision) benefit	(0.1)	0.1	0.1	0.1	0.5		0.1
Income from discontinued operations	$ (0.1)	$ 0.4		$ 0.4	$ 3.1		$ 0.8

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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- Definition

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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