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Income Taxes (Details) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017
Income Taxes
Remeasurement of deferred tax balances				$ 300,000
Federal statutory rate (as a percent)				21.00%
Amount of provisional income tax				$ 200,000		$ 3,600,000
Adjustment to provisional amounts recorded at December 30, 2017				$ 100,000
Increase in quarterly effective tax	$ 2.5
Effective tax rate (as a percent)	29.80%	27.30%	34.00%	25.10%	36.00%
Unrecognized gross tax benefits	$ 209,000			$ 209,000

X

- Definition

Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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Percentage of increase in quarterly effective tax rate due to CRA recorded a provisional amount.

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Amount of income tax expense (benefit) for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act of 2017.

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

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Amount of unrecognized tax benefits.

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