Income Taxes (Detail) $ in Millions	9 Months Ended
	Mar. 31, 2018 USD ($)
Income Tax Disclosure [Abstract]
Income Tax Expense Benefit Continuing Operations Adjustment Of Deferred Tax Asset Liability	$ (0.8)
Accumulated unremitted earnings tax rate for cash repatriation	15.50%
Accumulated unremitted earnings tax rate for non liquid asset	8.00%
Tax Benefit from Territorial Tax Conversion	$ 2.1
Deferred Tax Liabilities, withholding tax	0.8
Foreign tax credits related to future repatriations of earnings	14.2
Gross potential research and development (R&D) tax credit	7.8
Unrecognized tax benefits associated with federal tax credits	4.0
Deferred Tax Assets, Tax Credit Carryforwards	$ 3.8