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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
Income Tax Disclosure [Line Items]
Provision for income taxes	$ 3.2	$ 1.0
Gross unrecognized tax benefits	15.8		$ 15.2
Gross unrecognized tax benefits increased during the year	0.6
Interest and penalties accrued related to unrecognized tax benefits	1.2
Cumulative-effect adjustment related to retained earnings, tax	8.3
Maximum [Member]
Income Tax Disclosure [Line Items]
Estimated increase in unrecognized tax benefit in next twelve months	$ 1.6

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Income tax disclosure.

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Amount of the related income tax effect of a cumulative effect on retained earnings.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of increase reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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