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Company's Effective Tax Rate Differs From Statutory Federal Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Schedule Of Company Effective Tax Rate Differs From Statutory Federal Tax Rate [Line Items]
Tax at federal statutory rate	$ 28,878	$ 24,193	$ 24,897
Re-measurement of deferred tax assets to lower enacted domestic tax rate	15,137	0	0
Mandatory repatriation of foreign earnings	1,370	0	0
State taxes, net of federal benefit	2,806	2,423	2,910
Tax exempt interest income	0	(7)	(23)
Non-deductible expenses	417	274	261
Non-deductible stock-based compensation	18	11	(42)
Excess tax benefit from equity incentive plans	(5,831)	(4,321)	0
Difference between statutory rate and foreign effective tax rate	(1,339)	(889)	(897)
Other	(252)	(42)	428
Total	$ 41,204	$ 21,642	$ 27,534
Effective tax rate	49.90%	31.30%	38.70%

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to excess tax benefit from share based compensation.

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

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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