Leases Lease costs (Details) $ in Thousands	12 Months Ended
	Dec. 29, 2019 USD ($) Lease_Option	Dec. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 39,025
Operating lease expense		$ 32,306	$ 28,844
Finance lease amortization of right-of-use asset	649	0	0
Finance lease interest expense	1,063	0	0
Total lease expense	$ 40,737	$ 32,306	$ 28,844
Minimum
Lessee, Lease, Description [Line Items]
Lease renewal options | Lease_Option	1
Lease renewal term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease renewal options | Lease_Option	4
Lease renewal term	10 years