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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Jun. 30, 2016
Income Tax Disclosure [Line Items] |  |  |  |  |
Provision for income taxes | $ 6.3 | $ 1.4 | $ 13.9 | $ 20.1 |
Gross unrecognized tax benefits | 14.5 |  | 14.5 |  | $ 13.4
Gross unrecognized tax benefits increased during the year |  |  | 1.1 |  |
Interest and penalties accrued related to unrecognized tax benefits | 1.2 |  | 1.2 |  |
Decrease in interest and penalties accrued related to unrecognized tax benefits |  |  | 0.2 |  |
Maximum [Member] |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Estimated increase in unrecognized tax benefit in next twelve months | $ 1.0 |  | $ 1.0 |  |

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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=65882285&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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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