Discontinued Operations - Additional Information (Detail) (Australia And New Zealand Discontinued Operations [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Aug. 31, 2012	Dec. 31, 2009
Australia And New Zealand Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash	$ 0.1
Other net assets	0.8
Amount of proceeds in escrow	1.2	2.0
Remaining escrowed payments	0.8
Deferred tax benefit, net	11.0
Valuation allowance	$ 11.0

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the parent entity's basis in a discontinued operation.

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Amount of cash flows that are expected to continue with the disposal group that is a component of the entity (discontinued operation) after it has been sold or otherwise disposed of.

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- Definition

For the disposal group, including a component of the entity (discontinued operation), cash includes currency on hand as well as demand deposits with banks or financial institutions. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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- Definition

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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