Income Taxes - Additional Information (Detail) (USD $) In Millions	3 Months Ended
Sep. 30, 2011
Income Taxes [Line Items]
Net unrecognized tax benefits	$ 30.8
Net unrecognized tax benefits that would affect the company's effective tax rate if recognized	23.4
Previously unrecognized tax benefits, recognized	8.0
Reduction in income tax provision due to recognized previously unrecognized tax benefits	(5.7)
Net accrued interest related to uncertain tax positions	$ 2.1

Income Taxes [Line Items]

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- Definition

The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets.

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- Definition

The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

+ References

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-Glossary Unrecognized Tax Benefit

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- Definition

The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

+ References

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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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