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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2012
Income Taxes [Line Items]
Effective income tax rate	24.90%	21.90%
Variations between effective tax rates and the U.S. statutory rate	35.00%
Unrecognized income tax benefit	$ 3.2		$ 2.9

- 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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