Discontinued Operations (Detail) - Schedule of assets and liabilities of the discontinued operations (USD $) In Millions, unless otherwise specified	Nov. 30, 2011	May 31, 2011	Nov. 30, 2010
Accounts receivable, net	$ 0.1	$ 0.1	$ 0.2
Inventories, net		1.2	3.7
Other assets	9.2	9.2	14.3
Current assets of discontinued operations	9.3	10.5	18.2
Accounts payable	0.1	0.2	1.9
Accrued expenses and other current liabilities	0.6	0.6	1.8
Current liabilities of discontinued operations	$ 0.7	$ 0.8	$ 3.7

For the disposal group, including a component of the entity (discontinued operation), the aggregate of amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

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Carrying value as of the balance sheet date of current obligations (due less than one year or one operating cycle, if longer) arising from the sale, disposal or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation).

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