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Interest Rate Swaps (Details) - USD ($) $ in Thousands				3 Months Ended		9 Months Ended		12 Months Ended
Interest Rate Swaps (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Jun. 30, 2017	Mar. 31, 2016	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018	Mar. 30, 2019	Dec. 30, 2017
Derivative [Line Items]
Cumulative adjustment as a result of ASU 2017-12 adoption									$ 0
Other Comprehensive Income (Loss), Net of Tax				$ (809)	$ 227	$ (4,458)	$ 2,611
Beginning Balance [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax								$ 3,814		$ 3,358
Other Comprehensive Income (Loss) [Member]
Derivative [Line Items]
Change in fair value of interest rate swaps, net of taxes						(4,458)	2,611	456
Accounting Standards Update 2017-12 [Member]
Derivative [Line Items]
Cumulative adjustment as a result of ASU 2017-12 adoption	$ 717			717	0	717	0	0
Other Comprehensive Income (Loss), Net of Tax [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Net of Tax						(3,741)	2,611
AOCI Ending Balance [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 73			73	5,969	73	5,969
February 2016 Term Loan
Derivative [Line Items]
Interest Rate Swap Inception Date			Mar. 31, 2016
Interest Rate Swap Maturity Date	Feb. 19, 2021
Interest Rate Swap, Beginning Notional Amount			$ 197,500
June 2017 Term Loan
Derivative [Line Items]
Interest Rate Swap Inception Date		Jun. 30, 2017
Interest Rate Swap Maturity Date	Jun. 15, 2022
Interest Rate Swap, Beginning Notional Amount		$ 100,000
Interest Rate Swap Asset Portion
Derivative [Line Items]
Derivative Asset, Current	$ 631			631	2,735	631	2,735	2,601
Derivative Asset, Noncurrent	105			105	5,991	105	5,991	3,222
Total Derivative Asset	736			736	8,726	736	8,726	5,823
Interest Rate Swap Liability Portion
Derivative [Line Items]
Derivative Liability, Current	57			57	0	57	0	0
Derivative Liability, Noncurrent	581			581	0	581	0	0
Total Derivative Liability	$ 638			$ 638	$ 0	$ 638	$ 0	$ 0