Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018
Income Tax Contingency [Line Items]
U.S. statutory rate	21.00%
Effective income tax rate	19.10%	21.40%
Unrecognized tax benefits that would impact effective tax rate	$ 13.8		$ 9.9
Interest and penalties accrued	0.7		$ 0.6
Liability for uncertain tax positions that would impact the effective tax rate if recognized	$ 5.7
New Jersey
Income Tax Contingency [Line Items]
Income tax examination, year(s) under examination	2014 2015 2016 2017
United States Internal Revenue Service
Income Tax Contingency [Line Items]
Tax year remain open to examination	2015 2016 2017 2018
State Jurisdictions
Income Tax Contingency [Line Items]
Tax year remain open to examination	2014 2015 2016 2017 2018
Foreign Taxing Jurisdictions
Income Tax Contingency [Line Items]
Tax year remain open to examination	2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
U.S. Federal
Income Tax Contingency [Line Items]
Income tax examination, year(s) under examination	2016
Subsidiaries in Philippines
Income Tax Contingency [Line Items]
Income tax examination, year(s) under examination	2017
Subsidiary in Germany
Income Tax Contingency [Line Items]
Income tax examination, year(s) under examination	2012 2013 2014 2015