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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands				3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 29, 2018	Dec. 22, 2017	Dec. 21, 2017	Dec. 28, 2017	Dec. 29, 2016	Dec. 28, 2017	Dec. 29, 2016	Jun. 28, 2018
Income Tax Disclosure [Line Items]
Effective tax rate				39.00%	31.60%	35.40%	32.90%
Federal corporate income tax rate		21.00%	35.00%
Increase in income tax expense						$ 2,408
Excess tax benefits				$ 332		$ 446
Scenario Forecast [Member]
Income Tax Disclosure [Line Items]
Federal corporate income tax rate	21.00%							28.00%

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Discrete tax expense for revaluation of deferred tax assets.

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Excess tax benefits related to share based compensation expense.

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Income Tax Disclosure [Line Items]

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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://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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-Section S99
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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