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Business Segments and Geographic Information - Additional Information (Detail)
3 Months Ended 6 Months Ended
Mar. 31, 2018
USD ($)
Customer
Apr. 01, 2017
USD ($)
Mar. 31, 2018
USD ($)
Segment
Customer
Apr. 01, 2017
USD ($)
Segment Reporting Disclosure [Line Items]        
Number of operating segments | Segment     5  
Number of reportable segments | Segment     5  
Revenues | $ $ 789,300,000 $ 715,400,000 $ 1,580,400,000 $ 1,449,800,000
Customer represented greater than 10% of consolidated revenues 0 0 0  
Countries with greater than 10% of consolidated revenue | Customer 0   0  
Intersegment        
Segment Reporting Disclosure [Line Items]        
Revenues | $ $ 0 $ 0