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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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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of increase reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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