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Revenue Accounting for Contracts - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 01, 2021	Dec. 27, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 3,381,836	$ 3,360,049
United States
Disaggregation of Revenue [Line Items]
Revenues	2,457,041	2,532,716
Europe
Disaggregation of Revenue [Line Items]
Revenues	639,315	551,272
Canada
Disaggregation of Revenue [Line Items]
Revenues	55,627	55,396
Asia
Disaggregation of Revenue [Line Items]
Revenues	27,405	30,440
India
Disaggregation of Revenue [Line Items]
Revenues	14,548	5,980
Australia and New Zealand
Disaggregation of Revenue [Line Items]
Revenues	137,408	129,194
Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenues	$ 50,492	$ 55,051

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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