Income Taxes - Additional Information Regarding Examinations (Detail) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2015 |
Mar. 31, 2011 |
Mar. 31, 2018 |
|
| 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 | 2010 | 2007 | 2004 | |
| Tax years subject to examination | 2010 | |||
| Internal Revenue Service (IRS) | Latest Tax Year | ||||
| Income Tax Examination [Line Items] | ||||
| Tax years under audit | 2013 | 2009 | 2006 | |
| Tax years subject to examination | 2016 | |||