Leases Balance Sheet Classification (Details) - USD ($) $ in Thousands	Dec. 29, 2019	Sep. 29, 2019	Dec. 30, 2018
Leases [Abstract]
cec_financeleaseaccumamortization		$ 6,000
Operating Lease, Right-of-Use Asset	$ 532,913		$ 0
Finance Lease, Right-of-Use Asset	9,099
cec_leaserightofuseassettotal	542,012
Operating Lease, Liability, Current	48,920		0
Finance Lease, Liability, Current	810
Operating Lease, Liability, Noncurrent	525,535		$ 0
Finance Lease, Liability, Noncurrent	11,502
cec_totalleaseliability	$ 586,767