Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock at Cost	Accumulated Other Comprehensive (Loss) Income	Non-controlling Interests
Beginning Balance (in shares) at Dec. 27, 2014		67,268,817			22,474,331
Beginning Balance at Dec. 27, 2014	$ 488,261	$ 673	$ 189,012	$ 1,255,374	$ (955,613)	$ (1,185)
Net income (loss)	147,689			147,689
Dividends	(13,088)			(13,088)
Purchases of common stock (in shares)					2,497,748
Purchases of common stock	(161,152)				$ (161,152)
Issuance of stock related to stock-based compensation plans, including excess tax effect (in shares)		122,799
Issuance of stock related to stock-based compensation plans, including excess tax effect	(95)	$ 1	(96)
Stock-based compensation	6,925		6,925
Other comprehensive income (loss)	(2,303)					(2,303)
Ending Balance (in shares) at Dec. 26, 2015		67,391,616			24,972,079
Ending Balance at Dec. 26, 2015	466,237	$ 674	195,841	1,389,975	$ (1,116,765)	(3,488)
Net income (loss)	137,350			137,350
Dividends	(14,332)			(14,332)
Purchases of common stock (in shares)					773,281
Purchases of common stock	(50,516)				$ (50,516)
Issuance of stock related to stock-based compensation plans, including excess tax effect (in shares)		194,059			2,181
Issuance of stock related to stock-based compensation plans, including excess tax effect	672	$ 2	826		$ (156)
Stock-based compensation	2,747		2,747
Other comprehensive income (loss)	399					399
Ending Balance (in shares) at Dec. 31, 2016		67,585,675			25,747,541
Ending Balance at Dec. 31, 2016	542,557	$ 676	199,414	1,512,993	$ (1,167,437)	(3,089)
Net income (loss)	176,996			177,088			$ (92)
Dividends	(78,923)			(78,923)
Purchases of common stock (in shares)					0
Issuance of stock related to stock-based compensation plans, including excess tax effect (in shares)		154,705			1,952
Issuance of stock related to stock-based compensation plans, including excess tax effect	2,302	$ 1	2,464		$ (163)
Stock-based compensation	7,721		7,721
Other comprehensive income (loss)	(417)					(73)	(344)
Acquired business and noncontrolling interests	3,641						3,641
Ending Balance (in shares) at Dec. 30, 2017		67,740,380			25,749,493
Ending Balance at Dec. 30, 2017	$ 653,877	$ 677	$ 209,599	$ 1,611,158	$ (1,167,600)	$ (3,162)	$ 3,205