Noncontrolling Interests - Changes in Redeemable Noncontrolling Interests (Details)	12 Months Ended
	Dec. 30, 2018 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 25, 2016 USD ($)
Redeemable Noncontrolling Interests
Number of joint ventures under which noncontrolling interest holders have the option to require the Company to purchase their interests | item	1
Changes in redeemable noncontrolling interests
Balance at the beginning of the period	$ 6,738,000
Net income (loss)	(488,000)	$ 2,195,000	$ 3,665,000
Distributions to noncontrolling interests	(2,406,000)	(2,949,000)	(2,610,000)
Change in redemption value		(1,419,000)	(567,000)
Balance at the end of the period	5,464,000	6,738,000
Joint ventures
Changes in redeemable noncontrolling interests
Balance at the beginning of the period	6,738,000	8,461,000
Net income (loss)	(274,000)	2,195,000
Distributions to noncontrolling interests	(1,000,000)	(2,499,000)
Change in redemption value	0	(1,419,000)	(570,000)
Balance at the end of the period	$ 5,464,000	$ 6,738,000	$ 8,461,000