Income Taxes - Additional Information Regarding Examinations (Detail) |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Sep. 30, 2015 |
Mar. 31, 2011 |
Jun. 30, 2017 |
|
| 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 | 2017 | ||
| Internal Revenue Service (IRS) | Earliest Tax Year | |||
| Income Tax Examination [Line Items] | |||
| Tax years under audit | 2007 | 2004 | |
| Tax years subject to examination | 2010 | ||
| Internal Revenue Service (IRS) | Latest Tax Year | |||
| Income Tax Examination [Line Items] | |||
| Tax years under audit | 2009 | 2006 | |
| Tax years subject to examination | 2016 | ||