Other Balance Sheet Information - Other Balance Sheet Information of Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 28, 2015
Sep. 27, 2014
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 107.9 $ 115.6
Work-in-process 53.6 57.1
Finished goods 136.7 157.9
Inventories $ 298.2 $ 330.6