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Accrued Expenses and Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Detail) - USD ($)
$ in Millions
Sep. 29, 2018
Sep. 30, 2017
Other Long-Term Liabilities    
Reserve for income tax uncertainties $ 92.6 $ 88.3
Accrued lease obligation—long-term 35.5 34.1
Pension liabilities 9.9 10.0
Other 19.6 7.8
Total $ 157.6 $ 140.2