Long-Term Debt - 2017 Credit Agreement (Details)		3 Months Ended	12 Months Ended
	Dec. 28, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 27, 2017 USD ($) Instance	May 02, 2016 USD ($)	May 05, 2015 USD ($) Instance
Debt Instrument [Line Items]
Debt issuance costs		$ 5,241,000	$ 5,241,000
Interest expense			25,079,000	$ 10,836,000	$ 7,682,000
Unamortized debt issuance costs		$ 9,000,000	$ 9,000,000
2017 Term Loan Facility
Debt Instrument [Line Items]
Interest expense	$ 137,000
2017 Facilities
Debt Instrument [Line Items]
Number of times available borrowing limit can be increased | Instance						5
Available borrowing limit						$ 75,000,000
Debt issuance costs						8,800,000
Maximum consolidated total leverage ratio		5.5	5.5
Restricted payment basket amount		$ 15,000,000	$ 15,000,000
2017 Revolving Credit Facility
Debt Instrument [Line Items]
Debt issuance costs	$ 110,000
2015 Facilities
Debt Instrument [Line Items]
Number of times available borrowing limit can be increased | Instance								5
Available borrowing limit								$ 125,000,000
Debt issuance costs				$ 3,400,000			$ 1,000,000
Debt issuance costs		730,000	730,000			811,000
Maximum consolidated total leverage ratio				4.25
Term Loan
Debt Instrument [Line Items]
Debt issuance costs		5,241,000	5,241,000	$ 2,233,000
Term Loan | 2017 Term Loan Facility
Debt Instrument [Line Items]
Principal face amount of debt issued						$ 600,000,000
Principal amortization		1,500,000
Prepayment premium percentage						1.00%
Debt issuance costs						$ 5,600,000
Credit Facility | Revolving Credit Facility | 2017 Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility						500,000,000
Debt issuance costs		$ 3,000,000	$ 3,000,000			$ 3,200,000