Acquisitions (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Jul. 03, 2022 USD ($)	Jun. 27, 2021 USD ($)	Oct. 03, 2021 USD ($) employee
Business Acquisition [Line Items]
Payables related to promissory note	$ 14,578	$ 0
Minimum
Business Acquisition [Line Items]
Significant unobservable input, earn-out period	3 years
Minimum | Existing customer contracts
Business Acquisition [Line Items]
Useful life of intangible assets	1 year
Minimum | Trade names
Business Acquisition [Line Items]
Useful life of intangible assets	3 years
Maximum
Business Acquisition [Line Items]
Significant unobservable input, earn-out period	5 years
Maximum | Existing customer contracts
Business Acquisition [Line Items]
Useful life of intangible assets	10 years
Maximum | Trade names
Business Acquisition [Line Items]
Useful life of intangible assets	5 years
Business acquisitions
Business Acquisition [Line Items]
Fair value of acquisition purchase price	$ 86,500		$ 151,700
Initial cash payments	44,000		101,400
Receivables related to estimated post-closing adjustments	4,300
Payables related to promissory note	15,500
Contingent earn-out liability	31,300		50,300
Aggregate maximum of contingent consideration	$ 47,000		$ 74,000
Business acquisitions | Minimum
Business Acquisition [Line Items]
Earn-out period	3 years		3 years
Business acquisitions | Maximum
Business Acquisition [Line Items]
Earn-out period	5 years		4 years
Hoare Lea
Business Acquisition [Line Items]
Number of employees | employee			900
All acquisitions
Business Acquisition [Line Items]
Contingent earn-out liability	$ 83,300
Aggregate maximum of contingent consideration	$ 141,100