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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 06, 2018	Oct. 07, 2017	Oct. 06, 2018	Oct. 07, 2017	Dec. 30, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	11.90%	38.20%	20.60%	39.40%
Federal statutory rate			21.00%	35.00%
Provisional discrete income tax benefit, re-measurement of deferred income tax assets and liabilities					$ 26.0
Income tax benefit resulting from Tax Act	$ 0.5

X

- Definition

Amount of income tax expense for remeasurement of deferred tax asset from change in tax rate pursuant to Tax Cuts and Jobs Act.

+ References

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Tax cuts and Jobs act of 2017 change in tax rate income tax expense benefit.

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- Definition

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

+ References

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-Topic 235
-SubTopic 10
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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