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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Dec. 30, 2018
Mar. 29, 2020
Mar. 31, 2019
Sep. 29, 2019
Valuation Allowance [Line Items]          
Effective tax rate     19.50% (0.80%)  
Tax Cuts and Jobs Act, change in tax rate, income tax benefit   $ 2.6      
Effective income tax rate reconciliation, tax cuts and jobs act and valuation allowance impacts, percent       24.80%  
Liability for uncertain tax positions     $ 9.8   $ 9.2
AUSTRALIA          
Valuation Allowance [Line Items]          
Valuation allowance release $ 22.3