Assets Held for Sale - Components of Assets and Liabilities Held for Sale (Detail) (USD $) In Millions, unless otherwise specified	Nov. 30, 2012
Assets And Liabilities Disposed On Sale Of Business [Line Items]
Assets held for sale
Liabilities held for sale	1.1
Accounts Receivable [Member]
Assets And Liabilities Disposed On Sale Of Business [Line Items]
Assets held for sale	3.5
Equipment [Member]
Assets And Liabilities Disposed On Sale Of Business [Line Items]
Assets held for sale	0.1
Estimated Costs to Divest [Member]
Assets And Liabilities Disposed On Sale Of Business [Line Items]
Assets held for sale	(3.6)
Accounts Payable [Member]
Assets And Liabilities Disposed On Sale Of Business [Line Items]
Liabilities held for sale	0.1
Other Liabilities [Member]
Assets And Liabilities Disposed On Sale Of Business [Line Items]
Liabilities held for sale	$ 1.0