Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Compensation Related Costs [Abstract]
Employer matching contribution to a 401(k) plan	$ 0.8	$ 0.9	$ 0.9
Cash incentive plan expense	$ 7.2	$ 4.7	$ 1.0

Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration