XML 123 R108.htm IDEA: XBRL DOCUMENT v3.10.0.1
Quarterly Statement of Operations Information (Unaudited) - (Narrative) (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Jul. 01, 2017
Apr. 01, 2017
Sep. 29, 2018
Sep. 30, 2017
Sep. 24, 2016
Quarterly Financial Information Disclosure [Abstract]            
Restructuring charges       $ 14.2 $ 13.3 $ 10.5
Acquisition charges     $ 19.4      
Gain on sale of investments       0.0 5.6 25.1
Debt extinguishment loss $ 44.9 $ 2.6   $ 45.9 $ 3.2 $ 5.3