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Quarterly Statement of Operations Information (Unaudited) - (Narrative) (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Jul. 01, 2017
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]          
Debt extinguishment loss $ 44.9 $ 2.6 $ 0.8 $ 45.9 $ 3.2