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Income Taxes - Additional Information Regarding Examinations (Detail) | 3 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2016 | Jun. 30, 2011
Earliest Tax Year | Foreign Country |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Tax years subject to examination | 1996 |  |  |
Latest Tax Year | Foreign Country |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Tax years subject to examination | 2019 |  |  |
Internal Revenue Service (IRS) | Earliest Tax Year |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Tax years under audit |  | 2010 | 2007 | 2004
Tax years subject to examination | 2014 |  |  |
Internal Revenue Service (IRS) | Latest Tax Year |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Tax years under audit |  | 2013 | 2009 | 2006
Tax years subject to examination | 2017 |  |  |

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- Definition Tax year that remains open to examination under enacted tax laws, in CCYY format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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