Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 29, 2018	23,567
Balance at Dec. 29, 2018	$ 24	$ 72,008	$ 329,501	$ (10,387)	$ 391,146
Net earnings			69,772		69,772
Other comprehensive income (loss), net of tax				(7,634)	(7,634)
Equity-based compensation expense		12,684			$ 12,684
Common stock repurchased and retired (in shares)	(2,009)				(2,009)
Common stock repurchased and retired	$ (2)	(26,117)	(123,881)		$ (150,000)
Common stock issued under equity award plans (in shares)	73
Tax withholding for net-share settled equity awards		(1,682)			(1,682)
Balance (in shares) at Sep. 28, 2019	21,631
Balance at Sep. 28, 2019	$ 22	56,893	275,392	(18,021)	314,286
Balance (in shares) at Jun. 29, 2019	22,980
Balance at Jun. 29, 2019	$ 23	68,846	327,544	(12,257)	384,156
Net earnings			24,222		24,222
Other comprehensive income (loss), net of tax				(5,764)	(5,764)
Equity-based compensation expense		4,083			$ 4,083
Common stock repurchased and retired (in shares)	(1,358)				(1,358)
Common stock repurchased and retired	$ (1)	(16,002)	(76,374)		$ (92,377)
Common stock issued under equity award plans (in shares)	9
Tax withholding for net-share settled equity awards		(34)			(34)
Balance (in shares) at Sep. 28, 2019	21,631
Balance at Sep. 28, 2019	$ 22	56,893	275,392	(18,021)	$ 314,286
Balance (in shares) at Dec. 28, 2019	21,655				21,655
Balance at Dec. 28, 2019	$ 22	59,445	306,146	(13,901)	$ 351,712
Net earnings			85,035		85,035
Other comprehensive income (loss), net of tax				821	821
Equity-based compensation expense		10,519			$ 10,519
Common stock repurchased and retired (in shares)	(785)				(785)
Common stock repurchased and retired	$ (1)	(9,012)	(48,016)		$ (57,029)
Common stock issued under equity award plans (in shares)	150
Tax withholding for net-share settled equity awards		(1,941)			$ (1,941)
Balance (in shares) at Sep. 26, 2020	21,020				21,020
Balance at Sep. 26, 2020	$ 21	59,011	343,165	(13,080)	$ 389,117
Balance (in shares) at Jun. 27, 2020	21,017
Balance at Jun. 27, 2020	$ 21	55,526	312,659	(19,130)	349,076
Net earnings			30,506		30,506
Other comprehensive income (loss), net of tax				6,050	6,050
Equity-based compensation expense		3,528			3,528
Common stock issued under equity award plans (in shares)	3
Tax withholding for net-share settled equity awards		(43)			$ (43)
Balance (in shares) at Sep. 26, 2020	21,020				21,020
Balance at Sep. 26, 2020	$ 21	$ 59,011	$ 343,165	$ (13,080)	$ 389,117