Earnings per Share (Details)	3 Months Ended								12 Months Ended
	Dec. 30, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares	Jul. 01, 2018 USD ($) $ / shares	Apr. 01, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Sep. 24, 2017 USD ($) $ / shares	Jun. 25, 2017 USD ($) $ / shares	Mar. 26, 2017 USD ($) $ / shares	Dec. 30, 2018 USD ($) item $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 25, 2016 USD ($) $ / shares shares
Number of joint ventures for which the increase in redemption value for the noncontrolling interest reduces income attributable to common shareholders | item									1
Change in redemption value of noncontrolling interests										$ 1,419,000	$ 567,000
Basic earnings per common share:
Net income attributable to the Company	$ (13,849,000)	$ (13,033,000)	$ 11,791,000	$ 16,737,000	$ 28,509,000	$ 21,817,000	$ 23,538,000	$ 28,428,000	$ 1,646,000	102,292,000	102,820,000
Change in noncontrolling interest redemption value										1,419,000	567,000
Net income attributable to participating securities										(423,000)	(420,000)
Net income attributable to common shareholders									$ 1,646,000	$ 103,288,000	$ 102,967,000
Weighted average common shares outstanding | shares									32,083,000	36,083,000	37,253,000
Basic earnings per common share | $ / shares	$ (0.44)	$ (0.41)	$ 0.37	$ 0.50	$ 0.82	$ 0.61	$ 0.66	$ 0.78	$ 0.05	$ 2.86	$ 2.76
Diluted earnings per common share:
Net income attributable to common shareholders									$ 1,646,000	$ 103,288,000	$ 102,967,000
Weighted average common shares outstanding | shares									32,083,000	36,083,000	37,253,000
Dilutive effect of outstanding equity awards | shares									216,000	439,000	355,000
Diluted weighted average common shares outstanding | shares									32,299,000	36,522,000	37,608,000
Diluted earnings per common share | $ / shares	$ (0.44)	$ (0.41)	$ 0.36	$ 0.50	$ 0.81	$ 0.60	$ 0.65	$ 0.77	$ 0.05	$ 2.83	$ 2.74
Weighted average antidilutive awards excluded from computation of earnings per share | shares									1,200,000	278,000	331,000
Joint ventures
Change in redemption value of noncontrolling interests									$ 0	$ 1,419,000	$ 570,000
Basic earnings per common share:
Change in noncontrolling interest redemption value									$ 0	$ 1,419,000	$ 570,000