Income Taxes (Detail) $ in Millions	3 Months Ended
Sep. 30, 2017 USD ($)
Income Tax Disclosure [Abstract]
Foreign tax credits related to future repatriations of earnings	$ 13.5
Gross potential research and development (R&D) tax credit	7.6
Unrecognized tax benefits associated with federal tax credits	4.0
Deferred Income Tax Expense (Benefit)	$ 3.6

Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of unrecognized tax benefits.

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