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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 28, 2019
USD ($)
country
Jun. 29, 2018
USD ($)
Jun. 28, 2019
USD ($)
country
segment
Jun. 29, 2018
USD ($)
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Decrease in Cost of services provided $ 3,594,978 $ 3,526,293 $ 11,029,382 $ 10,611,532
Increase in Interest and Other Financing Costs, net 82,220 89,776 $ 249,375 256,562
Number of reportable segments | segment     3  
Accounting Standards Update 2017-07        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Decrease in Cost of services provided   $ (1,500)   $ (5,200)
Increase in Interest and Other Financing Costs, net 2,200      
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Decrease in Cost of services provided (82,624)   $ (265,821)  
Increase in Interest and Other Financing Costs, net $ 0   0  
Retained earnings     $ 58,400  
Foreign Countries Outside North America        
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]        
Number of foreign countries in which entity operates | country 18   18