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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions |  | 9 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax [Line Items] |  |  |
Income tax rate |  | 35.00% |
Blended statutory rate |  | 31.50% |
Non-cash decrease to income tax expense |  | $ 61.0 |
Tax rate |  | 2.00% | 33.00%
Reduction in deferred tax liabilities |  | $ 61.0 |
ASU 2016-09 [Member] |  |  |
Income Tax [Line Items] |  |  |
Cumulative Impact of the Adoption of ASU 2016-09 |  | $ 2.5 |
Subsequent Event [Member] |  |  |
Income Tax [Line Items] |  |  |
Income tax rate | 21.00% |  |

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