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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective income tax rate |  | 30.90% | 26.30% |  |  |
Unrecognized tax benefits that would impact effective tax rate | $ 8.9 | $ 8.9 |  |  |  | $ 7.6
Interest and penalties accrued | 0.5 | 0.5 |  |  |  | $ 0.3
Liability for uncertain tax positions that would impact the effective tax rate if recognized | 5.8 | 5.8 |  |  |  |
Tax cut and job act income tax benefit | $ 6.5 |  |  |  |  |
Cumulative provisional net charge due to change to territorial tax system |  | $ 9.3 |  |  |  |
United States Internal Revenue Service | Earliest Tax Year |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax year remain open to examination |  | 2014 |  |  |  |
United States Internal Revenue Service | Latest Tax Year |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax year remain open to examination |  | 2018 |  |  |  |
Maximum |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax cut and job act measurement period |  | 1 year |  |  |  |
State Jurisdictions | Earliest Tax Year |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax year remain open to examination |  | 2012 |  |  |  |
State Jurisdictions | Latest Tax Year |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax year remain open to examination |  | 2018 |  |  |  |
Foreign Taxing Jurisdictions | Earliest Tax Year |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax year remain open to examination |  | 2006 |  |  |  |
Foreign Taxing Jurisdictions | Latest Tax Year |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax year remain open to examination |  | 2018 |  |  |  |
Scenario Plan |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
U.S. statutory blended rate |  |  |  |  | 28.00% |
U.S. statutory rate |  |  |  | 21.00% | 28.00% |

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