Condensed Consolidated Statement Of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Cumulative effect of accounting change			$ 994		$ 994
Balance after cumulative effect of accounting change	$ 24	$ 76,542	289,064	$ (1,426)	364,204
Balance, shares at Dec. 30, 2017	24,024
Balance, value at Dec. 30, 2017	$ 24	76,542	288,070	(1,426)	363,210
Net earnings			93,893		93,893
Other comprehensive income (loss), net of tax				(8,475)	(8,475)
Equity-based compensation expense		11,026			11,026
Common stock repurchased and retired, value		(4,883)	(20,707)		$ (25,590)
Common stock repurchased and retired, shares	(217)				(217)
Common stock issued under equity award plans, shares	394
Tax withholding for net-share settled equity awards		(376)			$ (376)
Disgorgement of short-swing stock profits		907			907
Balance, shares at Sep. 29, 2018	24,201
Balance, value at Sep. 29, 2018	$ 24	83,216	362,250	(9,901)	435,589
Balance, shares at Jun. 30, 2018	24,220
Balance, value at Jun. 30, 2018	$ 24	83,542	349,579	(3,864)	429,281
Net earnings			31,040		31,040
Other comprehensive income (loss), net of tax				(6,037)	(6,037)
Equity-based compensation expense		3,968			3,968
Common stock repurchased and retired, value		(4,278)	(18,369)		$ (22,647)
Common stock repurchased and retired, shares	(178)				(178)
Common stock issued under equity award plans, shares	159
Tax withholding for net-share settled equity awards		(16)			$ (16)
Balance, shares at Sep. 29, 2018	24,201
Balance, value at Sep. 29, 2018	$ 24	83,216	362,250	(9,901)	$ 435,589
Balance, shares at Dec. 29, 2018	23,567				23,567
Balance, value 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, value	$ (2)	(26,117)	(123,881)		$ (150,000)
Common stock repurchased and retired, shares	(2,009)				(2,009)
Common stock issued under equity award plans, shares	73
Tax withholding for net-share settled equity awards		(1,682)			$ (1,682)
Balance, shares at Sep. 28, 2019	21,631				21,631
Balance, value at Sep. 28, 2019	$ 22	56,893	275,392	(18,021)	$ 314,286
Balance, shares at Jun. 29, 2019	22,980
Balance, value 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, value	$ (1)	(16,002)	(76,374)		$ (92,377)
Common stock repurchased and retired, shares	(1,358)				(1,358)
Common stock issued under equity award plans, shares	9
Tax withholding for net-share settled equity awards		(34)			$ (34)
Balance, shares at Sep. 28, 2019	21,631				21,631
Balance, value at Sep. 28, 2019	$ 22	$ 56,893	$ 275,392	$ (18,021)	$ 314,286