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Income Taxes (Detail) (USD $)	3 Months Ended
Income Taxes (Detail) (USD $)	Sep. 30, 2012	Sep. 30, 2011
Schedule Of Income Taxes [Line Items]
Income tax expense	$ 17,211,000	$ 14,867,000
Effective tax rate	24.00%	23.50%
Tax reserves on uncertain tax positions	900,000
Additional interest on uncertain tax positions	$ 100,000

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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