Income Taxes (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Federal statutory income tax rate (in Percent)		35.00%
Release of tax reserve against federal tax credits taken in prior years	$ 7.0	$ 0.4	$ 5.7