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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	4 Months Ended		12 Months Ended
	Apr. 21, 2018	Apr. 22, 2017	Dec. 30, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	27.70%	32.80%
Federal statutory rate	21.00%	35.00%
Provisional discrete income tax benefit, re-measurement of deferred income tax assets and liabilities			$ 26.0
Federal return due date	Oct. 15, 2018

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Federal return due date.

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

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

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