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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	4 Months Ended		12 Months Ended
	Apr. 18, 2020	Apr. 20, 2019	Dec. 30, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	0.20%	25.90%
Net discrete income tax benefit on initial analysis of impact of CARES Act	$ 4.3
Federal statutory income tax rate			35.00%

X

- Definition

CARES Act Of 2020 net discrete income tax benefit.

+ References

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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-SubTopic 10
-Section 50
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