Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Sep. 29, 2018
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross	$ 534,939	$ 534,939
Accumulated amortization	(373,898)	(359,756)
Other intangible assets, net	161,041	175,183
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross	499,432	499,432
Accumulated amortization	(344,117)	(330,571)
Non-compete Agreements [Member]
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross	33,540	33,540
Accumulated amortization	(28,409)	(27,836)
Other [Member]
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross	1,967	1,967
Accumulated amortization	$ (1,372)	$ (1,349)