Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($) $ in Thousands		Mar. 30, 2019	Sep. 29, 2018
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross		$ 539,324	$ 534,939
Accumulated amortization		(387,916)	(359,756)
Other intangible assets, net		151,408	175,183
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross	[1]	503,017	499,432
Accumulated amortization		(357,526)	(330,571)
Non-compete Agreements [Member]
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross	[1]	34,340	33,540
Accumulated amortization		(28,995)	(27,836)
Other [Member]
Finite Lived Intangible Assets [Line Items]
Other intangible assets, gross		1,967	1,967
Accumulated amortization		$ (1,395)	$ (1,349)

[1] Reflects the impact from the acquisition (Note 4).