Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Cash flows from operating activities:
Net income	$ 65,077	$ 51,417	$ 50,519
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	61,291	57,172	47,630
Stock-based compensation	15,763	11,961	10,290
Net loss on disposals and impairments of assets	249	27	190
Excess tax benefits from stock-based compensation	0	(517)	(2,182)
Deferred income taxes	2,042	(1,640)	11,924
Gain on sale of non-marketable equity securities	0	0	(6,891)
Changes in operating assets and liabilities, net of effect of acquisition:
Accounts receivable	393	9,297	(9,259)
Inventories	(9,272)	11,574	(33,065)
Income taxes	1,697	25,119	(13,943)
Prepaid expenses and other assets	(12,405)	(2,195)	8,680
Accounts payable	21,779	(4,965)	19,130
Customer prepayments	1,560	(25,266)	22,735
Accrued compensation and benefits	15,398	2,808	(17,493)
Other taxes and withholding	(893)	2,723	135
Other accruals and liabilities	9,928	14,130	19,542
Net cash provided by operating activities	172,607	151,645	107,942
Cash flows from investing activities:
Purchases of property and equipment	(59,829)	(57,852)	(85,586)
Decrease in restricted cash	3,150	0	0
Proceeds from sales of property and equipment	36	92	72
Proceeds from marketable debt securities	0	21,053	127,664
Investments in marketable debt securities	0	(5,968)	(29,299)
Acquisition of business	0	0	(70,018)
Proceeds from non-marketable equity securities	0	0	12,891
Net cash used in investing activities	(56,643)	(42,675)	(44,276)
Cash flows from financing activities:
Repurchases of common stock	(155,245)	(126,693)	(100,201)
Net increase in short-term borrowings	28,094	5,932	1,097
Proceeds from issuance of common stock	3,241	2,298	2,976
Debt issuance costs	(12)	(409)	(721)
Excess tax benefits from stock-based compensation	0	517	2,182
Net cash used in financing activities	(123,922)	(118,355)	(94,667)
Net decrease in cash and cash equivalents	(7,958)	(9,385)	(31,001)
Cash and cash equivalents, at beginning of period	11,609	20,994	51,995
Cash and cash equivalents, at end of period	3,651	11,609	20,994
Supplemental Cash Flow Information [Abstract]
Income taxes paid (received)	22,807	(653)	26,681
Interest paid	753	608	96
Purchases of property and equipment included in accounts payable	$ 3,964	$ 5,517	$ 5,051