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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2018	Sep. 30, 2017	Apr. 01, 2017	Dec. 30, 2017
Income Taxes [Line Items]
Effective income tax rate reconciliation, at federal statutory income tax rate, percent	21.00%
Effective tax rate	40.00%		39.00%
U.S. Federal and State
Income Taxes [Line Items]
Estimated valuation allowance, determined to be reduced				$ 40
Non-cash income tax benefit		$ 37

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- Definition

Income Taxes [Line Items]

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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