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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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Effective income tax rate reconciliation at federal blended statutory income tax rate percent.

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Income tax.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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