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Revenue Accounting for Contracts - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 3,360,049	$ 3,083,788
United States
Disaggregation of Revenue [Line Items]
Revenues	2,532,705	2,182,304
Europe
Disaggregation of Revenue [Line Items]
Revenues	551,272	614,224
Canada
Disaggregation of Revenue [Line Items]
Revenues	55,396	50,488
Asia
Disaggregation of Revenue [Line Items]
Revenues	30,440	35,611
India
Disaggregation of Revenue [Line Items]
Revenues	5,980	12,639
Australia and New Zealand
Disaggregation of Revenue [Line Items]
Revenues	129,194	126,647
South America and Mexico
Disaggregation of Revenue [Line Items]
Revenues	11	2,649
Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenues	$ 55,051	$ 59,226

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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