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
Cummulative effect of accounting change			$ 994		$ 994
Balance after cumulative effect of accounting change	$ 24	76,542	289,064	(1,426)	$ 364,204
Balance, shares (Scenario, Previously Reported [Member]) at Dec. 30, 2017	24,024
Balance, shares at Dec. 30, 2017	24,024				24,024
Balance, value (Scenario, Previously Reported [Member]) at Dec. 30, 2017	$ 24	76,542	288,070	(1,426)	$ 363,210
Balance, value at Dec. 30, 2017					363,210
Net earnings			28,946		28,946
Other comprehensive income (loss), net of tax				7,274	7,274
Equity-based compensation expense		3,805			3,805
Common stock repurchased and retired, value		$ (605)	$ (2,338)		$ (2,943)
Common stock repurchased and retired, shares	(39)				(39)
Common stock issued under equity award plans, shares
Common stock issued under equity award plans, value	$ 114
Tax withholding for net-share settled equity awards		$ (308)			$ (308)
Balance, shares at Mar. 31, 2018	24,099				24,099
Balance, value at Mar. 31, 2018	$ 24	$ 79,434	$ 315,672	$ 5,848	$ 400,978