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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 23, 2017	Dec. 29, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2018
Income Taxes [Abstract]
Income tax expense, change in tax rate effect of deferred assets and liabilities	$ 5.3
Income tax benefit, change in tax rate, reduction of basis points	$ 2.3
Unrecognized tax benefits		$ 6.9				$ 6.2
Interest and penalties accrued related to unrecognized tax benefits		0.5				$ 0.4
Income tax benefit from accounting adjustments		$ (2.0)
Federal tax rate			21.00%	35.00%	35.00%

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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 valuation allowance for deferred tax assets.

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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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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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