Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 30, 2018	Dec. 31, 2017	Dec. 25, 2016
Retirement Benefits [Abstract]
Company's contributions to defined-contribution plans	$ 3.9	$ 3.8	$ 3.5

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