Income Taxes (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012
Income Taxes [Line Items]
Effective income tax rate Effective income tax rate	24.20%	23.90%
Variations between effective tax rates and the U.S. statutory rate	35.00%
Unrecognized income tax benefit	$ 3.0		$ 2.9