Description of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended	7 Months Ended	12 Months Ended
	Mar. 29, 2018	Dec. 31, 2015	Dec. 28, 2017	Dec. 29, 2016	May 28, 2015
Summary of Significant Accounting Policies [Line Items]
Depreciation		$ 23,893,000	$ 51,542,000	$ 42,085,000	$ 38,368,000
Percentage Of Cash Dividends			110.00%
Senior Notes, Noncurrent			$ 129,143,000	90,286,000
Inventory, Net, Total			$ 4,062,000	4,437,000
Concentration Risk, Labor Subject to Collective Bargaining Arrangements			As of December 28, 2017, 7% of the Companys employees were covered by a collective bargaining agreement, of which 1% are covered by an agreement that will expire in one year. As of December 29, 2016, 7% of the Companys employees were covered by a collective bargaining agreement, of which 2% were covered by an agreement that expired within in one year.
Interest Costs Capitalized		32,000	$ 400,000	277,000	194,000
Amortization of Debt Issuance Costs		$ 258,000	308,000	303,000	$ 449,000
Deferred Revenue, Current			$ 32,711,000	$ 28,485,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		456,000	250,000	14,000	434,000
Decrease (increase) in restricted cash		$ (9,259,000)	$ 967,000	$ 12,553,000	$ (728,000)
Accounting Standards Update 2017-09 [Member]
Summary of Significant Accounting Policies [Line Items]
Operating Expenses			$ 1,712,000	$ 1,519,000
Accounting Standards Update 2014-09 [Member] | Scenario, Forecast [Member]
Summary of Significant Accounting Policies [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax	$ 3,500,000
Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Investment Option Exercise Price		$ 19.74	$ 31.20	$ 23.37	$ 18.34
Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Equity Method Investment, Ownership Percentage			50.00%
Investment Option Exercise Price		$ 23.37	$ 31.55	$ 31.55	$ 23.37
Corporate Joint Venture One [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Ownership Interest In Joint Ventures			50.00%
Corporate Joint Venture Two [Member]
Summary of Significant Accounting Policies [Line Items]
Ownership Interest In Joint Ventures			50.00%
Fair Value, Inputs, Level 1 [Member]
Summary of Significant Accounting Policies [Line Items]
Available-for-sale Securities, Fair Value Disclosure			$ 70,000	$ 93,000
Trading Securities, Fair Value Disclosure			3,983,000	1,927,000
Fair Value, Inputs, Level 2 [Member]
Summary of Significant Accounting Policies [Line Items]
Interest Rate Fair Value Hedge Liability at Fair Value			13,000	$ 6,000
Senior Notes, Noncurrent			$ 125,188,000