Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Cash paid for income taxes	$ 13.0	$ 17.2	$ 11.9
Effective income tax rate, reductions	0.22%	0.12%	0.07%
Cumulative foreign undistributed net earnings	$ 419.0
Additional deferred tax liability due to undistributed foreign earnings	83.0
Interest and penalties recognized within income tax expense (benefit)	(0.1)	$ 0.0	$ 0.1
Interest and penalties accrued	0.1	0.2	$ 0.2
Unrecognized tax benefits that would impact effective tax rate	3.6	$ 2.8
Unrecognized tax benefits expected decrease during the next twelve months	$ 0.7
Income tax examination, year(s) under examination	2011