Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)
Beginning balance, shares at Dec. 31, 2016		27,238,000
Beginning balance at Dec. 31, 2016	$ 388,956	$ 272	$ 161,885	$ 226,950	$ (151)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock plans	367,267	367,000
Issuance of common stock under employee stock plans	$ 10,573	$ 4	10,569
Conversion of deferred compensation	15,000
Vesting of restricted stock units		376,000
Vesting of restricted stock units	$ 0	$ 4	(4)
Stock-based compensation	19,751		19,751
Stock withheld to cover tax withholdings requirements upon restricted stock vesting		(51,000)
Stock withheld to cover tax withholdings requirements upon restricted stock vesting	(2,983)	$ 1	(2,982)
Other comprehensive income	2,143				2,143
Directors' deferred compensation	65		65
Net income	50,964			50,964
Ending balance, shares at Dec. 30, 2017		27,945,000
Ending balance at Dec. 30, 2017	470,327	$ 279	190,067	277,989	1,992
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of a change in accounting principle related to adoption of ASC 606	$ 858		783	75
Issuance of common stock under employee stock plans	239,830	285,000
Issuance of common stock under employee stock plans	$ 10,366	$ 3	10,363
Vesting of restricted stock units		408,000
Vesting of restricted stock units	0	$ 4	(4)
Stock-based compensation	25,804		25,804
Stock withheld to cover tax withholdings requirements upon restricted stock vesting		(51,000)
Stock withheld to cover tax withholdings requirements upon restricted stock vesting	(3,532)	$ 0	(3,532)
Other comprehensive income	(6,740)				(6,740)
Directors' deferred compensation	$ 65		65
Stock repurchases	(798,794)
Stock repurchases	$ (50,000)	$ (8)	(49,992)
Net income	$ 87,992			87,992
Ending balance, shares at Dec. 29, 2018	27,788,272	27,788,000
Ending balance at Dec. 29, 2018	$ 535,322	$ 278	172,771	367,021	(4,748)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of a change in accounting principle related to adoption of ASC 606	$ 1,040			1,040
Issuance of common stock under employee stock plans	127,024	187,000
Issuance of common stock under employee stock plans	$ 7,147	$ 2	7,145
Vesting of restricted stock units		436,000
Vesting of restricted stock units	0	$ 5	(5)
Stock-based compensation	23,744		23,744
Stock withheld to cover tax withholdings requirements upon restricted stock vesting		59,000
Stock withheld to cover tax withholdings requirements upon restricted stock vesting	7,277	$ 1	7,276
Other comprehensive income	7,757				7,757
Directors' deferred compensation	76		76
Net income	$ 85,300			85,300
Ending balance, shares at Dec. 28, 2019	28,352,390	28,352,000
Ending balance at Dec. 28, 2019	$ 652,069	$ 284	$ 196,455	$ 452,321	$ 3,009